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Purpose: The symptoms of urethral stricture are non-specific and may overlap with other common conditions that can confound diagnosis. Urologists play a key role in the initial evaluation of urethral stricture, currently provide all accepted treatments, and must be familiar with the evaluation, diagnostic tests, and surgical treatments for urethral stricture. Materials and Methods: A systematic review of the literature using the Pubmed, Embase, and Cochrane databases (search dates January 1, 1990 to January 12, 2015) was conducted to identify peer-reviewed publications relevant to the diagnosis and treatment of urethral stricture in men. The review yielded an evidence base of 250 articles after application of inclusion/exclusion criteria. The search for the 2023 Amendment was modified to included females and males (search dates December 2015dOctober 2022 for males; January 1990dOctober 2022 for females) and a new Key Question on sexual dysfunction was added (search dates: January 1990d10/2022). After inclusion and exclusion criteria were applied, 81 studies were added to the existing evidence base. Results: Once a urethral stricture is diagnosed, clinicians should determine the length and location of the stricture in order to inform treatment. After a period of urethral rest, patients with short (<2cm) bulbar urethral stricture may be treated endoscopically. Urethroplasty may be performed by an experienced surgeon in patients with first time or recurrent anterior and posterior urethral strictures. The best treatment option for urethral stricture in female patients is urethroplasty using oral mucosa grafts or vaginal flaps rather than endoscopic treatment. Conclusion: This guideline provides evidence-based guidance to clinicians and patients regarding how to recognize symptoms and signs of a urethral stricture/stenosis, carry out appropriate testing to determine the location and severity of the stricture, and recommend the best options for treatment. The most effective approach for a particular patient is best determined by the individual clinician and patient in the context of that patient's history, values, and goals for treatment. [ABSTRACT FROM AUTHOR]

Purpose Prior to urethral reconstruction many patients with stricture undergo a variable period during which endoscopic treatments are performed for recurrent obstructive symptoms. We evaluated the association among urethroplasty delay, endoscopic treatments and subsequent reconstructive outcomes. Materials and Methods We reviewed the records of men who underwent primary bulbar urethroplasty from 2007 to 2014. Those with prior urethroplasty, penile and/or membranous strictures and incomplete data were excluded from analysis. Men were stratified by a urethroplasty delay of less than 5, 5 to 10 or greater than 10 years from diagnosis. Results A total of 278 primary bulbar urethroplasty cases with complete data were evaluated. Median time between stricture diagnosis and reconstruction was 5 years (IQR 2–10). Patients underwent an average ± SD of 0.9 ± 2.4 endoscopic procedures per year of delay. Relative to less than 5 and 5 to 10 years a delay of greater than 10 years was associated with more endoscopic treatments (median 1 vs 2 vs 5), repeat self-dilations (13% vs 14% vs 34%), strictures longer than 2 cm (40% vs 39% vs 56%) and complex reconstructive techniques (17% vs 17% vs 34%). An increasing number of endoscopic treatments was independently associated with strictures longer than 2 cm (OR 1.06, p = 0.003), which had worse 24-month stricture-free survival than shorter strictures (83% vs 96%, p = 0.0003). Each consecutive direct vision internal urethrotomy was independently associated with the risk of urethroplasty failure (HR 1.19, p = 0.02). Conclusions Urethroplasty delay is common and often associated with symptomatic events managed by repeat urethral manipulations. Endoscopic treatments appear to lengthen strictures and increase the complexity of repair. [ABSTRACT FROM AUTHOR]

Purpose We compared the results of initial excision and primary anastomosis urethroplasty to the excision and primary anastomosis outcomes of other challenging reoperative clinical settings, including secondary cases (prior urethroplasty of any technique other than excision and primary anastomosis) and repeat cases (prior excision and primary anastomosis). Materials and Methods We reviewed our database of patients who underwent excision and primary anastomosis urethroplasty for bulbar urethral stricture at our tertiary referral center from 2007 to 2014. Patients without available data and those with a history of lichen sclerosus, radiation, pelvic fracture urethral injuries, distal strictures and/or hypospadias were excluded from analysis. Patient characteristics and outcomes were compared between those undergoing initial, secondary, and repeat excision and primary anastomosis urethroplasty for bulbar urethral stricture. Results Among 898 urethroplasties performed during the study period we identified 305 men who underwent excision and primary anastomosis urethroplasty of the bulbar urethra, including an initial procedure in 268 of 305 (88%) and reoperation in 37 (12%). Of patients with reoperation 18 of 37 (49%) underwent secondary excision and primary anastomosis following a different type of prior urethroplasty and 19 (51%) underwent repeat excision and primary anastomosis. Repeat excision and primary anastomosis in the bulbar urethra was successful in 18 of 19 patients (95%), which was comparable to the success rate of initial bulbar excision and primary anastomosis (251 of 268 or 94%) as well as secondary bulbar excision and primary anastomosis (17 of 18 or 94%, p = 0.975) with a similar mean stricture length. Mean followup for all patients was 41.5 months (range 6 to 90) and mean followup in each group was greater than 30 months. Conclusions Repeat excision and primary anastomosis urethroplasty has excellent results for short bulbar strictures, comparable to those achieved in the initial and secondary setting. [ABSTRACT FROM AUTHOR]

Purpose We compared functional outcomes in patients who received an artificial urinary sphincter in the space of Retzius vs the same device placed at a high submuscular location. Materials and Methods We reviewed a prospectively maintained database of patients who received an artificial urinary sphincter between July 2007 and December 2014. After cuff placement was completed via a perineal incision, a 61 to 70 cm H 2 O pressure regulating balloon was placed through a separate high scrotal incision in the space of Retzius or in a high submuscular tunnel. Demographics, perioperative comorbidities and functional outcomes were compared between the groups. Results A total of 294 consecutive patients underwent artificial urinary sphincter placement. Mean followup was 23 months. Space of Retzius and high submuscular placement was performed in 140 (48%) and 154 patients (52%), respectively. Functional outcomes were similar between the groups, including the continence rate (defined as 0 or 1 pad daily) in 81% vs 88% (p = 0.11), the erosion rate in 9% vs 8% (p = 0.66) and the explantation rate in 10% vs 11% (p = 0.62). Artificial urinary sphincter revision for persistent incontinence was required in a similar proportion of the 2 groups (13% vs 8%, p = 0.16) with a comparable mean followup (24 vs 23 months, p = 0.30). Kaplan-Meier analysis revealed no difference between the groups in the rate of explantation (p = 0.70) or revision (p = 0.06). Conclusions High submuscular placement of a pressure regulating balloon at artificial urinary sphincter surgery is a safe, effective alternative with functional outcomes equivalent to those of traditional placement in the space of Retzius. [ABSTRACT FROM AUTHOR]

Purpose We analyzed our initial 100-case experience with the 3.5 cm artificial urinary sphincter cuff to identify risk factors for cuff erosion. Materials and Methods We reviewed the records of a single surgeon, consecutive series of patients treated with 3.5 cm artificial urinary sphincter cuff placement from September 2009 to August 2013. Each patient underwent single perineal cuff placement via standardized technique. Preoperative characteristics, technical considerations and postoperative outcomes were analyzed and compared to those in a cohort of patients in whom a larger (4.0 cm or greater) artificial urinary sphincter cuff was placed during the same period. We identified clinical factors associated with an increased risk of 3.5 cm artificial urinary sphincter cuff erosion. Results Of the 176 men who met study inclusion criteria during the 4-year period 100 (57%) received the 3.5 cm artificial urinary sphincter cuff and 76 (43%) received a larger cuff (4.0 cm or greater). The continence rate (83% vs 80%, p = 0.65) and mean followup (32 vs 25 months, p = 0.14) were similar in the 2 groups. Erosion developed in 16 of the 176 patients (9%) during the study period, of whom 13 had the 3.5 cm cuff. Of the 100 patients with the 3.5 cm cuff 52 (52%) had a history of radiation, including 11 (21%) with erosion. Cuff erosion developed only rarely in nonirradiated men (2 of 48 or 4%, p = 0.01). A history of radiation was the only significant risk factor associated with 3.5 cm cuff erosion (OR 6.2, 95% CI 1.3–29.5). Conclusions Men with a history of radiation who underwent placement of a 3.5 cm artificial urinary sphincter cuff experienced an increased (21%) risk of cuff erosion. [ABSTRACT FROM AUTHOR]

Purpose We evaluated the clinical course of patients with pelvic fracture urethral injury referred to our institution to elucidate the differences between initial management strategies. Materials and Methods We retrospectively reviewed our institutional review board approved, prospectively maintained urethroplasty database from 2007 to 2013. Patients with pelvic fracture urethral injury were stratified into 2 groups based on initial treatment before referral. Group 1 (21 of 38, 55%) was treated with suprapubic tube placement alone followed by elective bulbomembranous anastomotic urethroplasty and group 2 (17 of 38, 45%) underwent early primary endoscopic realignment. We recorded the number of endoscopic interventions and time from injury to successful definitive treatment. Data regarding stricture length, reconstruction technique and treatment outcomes were analyzed. Results Among 766 urethroplasties performed during the study interval 38 (5%) consecutive pelvic fracture urethral injury cases were identified with complete information available and all underwent repair with excision with primary anastomosis. For suprapubic tube/bulbomembranous anastomotic urethroplasty cases the mean time to definitive resolution of stenosis was dramatically shorter (7 months, range 3 to 15) compared to primary endoscopic realignment cases (122 months, range 4 to 574; p <0.01). The majority of patients treated with primary endoscopic realignment required multiple endoscopic urethral interventions (median 4, range 1 to 36; p <0.01) and/or experienced various other adverse events which were rarely noted in the suprapubic tube/bulbomembranous anastomotic urethroplasty group (14 of 17 [82%] vs 2 of 21 [10%], p <0.05). Conclusions Treatment of pelvic fracture urethral disruption injuries with primary endoscopic realignment appears to be associated with unintended negative consequences including additional interventions and a prolonged clinical course. [ABSTRACT FROM AUTHOR]

Purpose Many patients with persistent incontinence after an artificial urinary sphincter procedure gain improved continence after cuff downsizing. In 2010 a new, smaller (3.5 cm) artificial urinary sphincter cuff was introduced. We hypothesized that men with spongiosal atrophy previously treated with a 4.0 cm cuff would now show a decreased rate of revision surgery due to more accurate cuff sizing. Materials and Methods We evaluated the outcome in men who received identical 4.0 cm cuff sizes in 2 eras, before (2007 to 2009) and after (2010 to 2013) the introduction of the 3.5 cm artificial urinary sphincter cuff. Patients with a history of cuff erosion or those undergoing tandem, transcorporal, or 4.5 cm or greater cuff placement were excluded from analysis. We validated our institutional results using the nationwide AMS® PIF (Patient Information Form) database from identical time frames. Results Of 236 men who underwent artificial urinary sphincter placement at our institution during the study period 170 with a mean age of 67 years met study inclusion criteria, of whom 88 (52%) received a 4.0 cm artificial urinary sphincter cuff. Mean followup was 34 months. Ten of 45 patients (22.2%) who had a 4.0 cm cuff placed from 2007 to 2009 required cuff downsizing for persistent incontinence while only 2 of 43 (4.7%) who received a 4.0 cm cuff from 2010 to 2013 required revision (p <0.001). Nationally patients with a 4.0 cm cuff underwent fewer revisions during the latter era (16.2% vs 7.5%, p = 0.001). In local and national cohorts Kaplan-Meier analysis revealed improved survival of the 4.0 cm cuff after the introduction of the 3.5 cm cuff (p <0.05). Conclusions The incidence of artificial urinary sphincter revision surgery in patients with a 4.0 cm cuff has decreased since the availability of the 3.5 cm cuff. This suggests that precise cuff sizing appears to be beneficial in men with spongiosal atrophy. [ABSTRACT FROM AUTHOR]

Purpose For ventral buccal mucosa graft onlay during bulbar urethroplasty, spongioplasty with advancement and closure of the corpus spongiosum is ordinarily performed to stabilize the graft. In the pendulous and distal bulbar urethra the spongiosum is often too thin to allow complete graft coverage. We describe the results of what to our knowledge is a novel technique for ventral graft coverage using periurethral vascularized tissue. We compared these results to those of conventional spongioplasty. Materials and Methods We retrospectively reviewed all urethroplasties performed by 2 surgeons at separate tertiary care facilities from July 2007 to July 2012. One-stage urethroplasties involving ventral buccal mucosa graft placement were selected for analysis. Conventional spongioplasty was performed when possible. When spongiosal tissue was inadequate for graft coverage, periurethral tissue flaps were mobilized bilaterally and sutured together in the midline as pseudospongioplasty to provide coverage. We compared the outcomes of the 2 techniques. Results Of 637 urethroplasties performed during the 5-year study period 102 (16%) with a buccal mucosa graft onlay met study inclusion criteria. Pseudospongioplasty was performed in 46 of 102 cases (45%), predominantly in the pendulous urethra (34 of 46 or 74%), with success in 37 of 46 (80%) at a mean followup of 41 months. Conventional spongioplasty had a similar 84% success rate (47 of 56 cases) at a mean followup of 39 months (p = 0.645). For conventional spongioplasty mean stricture length was 4.7 cm compared to 5.8 cm for pseudospongioplasty (p = 0.028). Conclusions Ventral buccal mucosa grafts can be applied reliably to various locations throughout the anterior urethra. For distal grafts, flaps of periurethral tissue provide a suitable host bed for revascularization with results equivalent to those of conventional spongioplasty. [ABSTRACT FROM AUTHOR]

Purpose The authors of this guideline reviewed the urologic trauma literature to guide clinicians in the appropriate methods of evaluation and management of genitourinary injuries. Materials and Methods A systematic review of the literature using the MEDLINE® and EMBASE databases (search dates 1/1/90-9/19/12) was conducted to identify peer-reviewed publications relevant to urotrauma. The review yielded an evidence base of 372 studies after application of inclusion/exclusion criteria. These publications were used to inform the statements presented in the guideline as Standards, Recommendations or Options. When sufficient evidence existed, the body of evidence for a particular treatment was assigned a strength rating of A (high), B (moderate) or C (low). In the absence of sufficient evidence, additional information is provided as Clinical Principles and Expert Opinions. Results Guideline statements were created to inform clinicians on the initial observation, evaluation and subsequent management of renal, ureteral, bladder, urethral and genital traumatic injuries. Conclusions Genitourinary organ salvage has become increasingly possible as a result of advances in imaging, minimally invasive techniques, and reconstructive surgery. As the field of genitourinary reconstruction continues to evolve, clinicians must strive to approach clinical problems in a creative, multidisciplinary, evidence-based manner to ensure optimal outcomes. [ABSTRACT FROM AUTHOR]

Purpose We compare stricture outcomes in patients with artificial urinary sphincter cuff erosion managed with and without synchronous urethral repair. Materials and Methods Records of patients who underwent artificial urinary sphincter removal for cuff erosion from 2007 to 2013 were retrospectively reviewed. Two cohorts of patients were evaluated, with those in group 1 treated with in situ urethroplasty and those in group 2 treated with a Foley catheter only. We compared demographic, clinical and radiological data to assess resultant stricture disease, and compared operative times between the cohorts. Results Of the 26 artificial urinary sphincter cuff erosion cases identified 13 underwent in situ urethroplasty while 13 did not. Mean patient age was 73 years (range 61 to 83) with a mean followup of 24 months (range 8 to 69). The rate of urethral stricture formation after artificial urinary sphincter explantation was significantly reduced among patients treated with in situ urethroplasty (5 of 13, 38%) compared to those treated with Foley catheter only (11 of 13, 85%; p = 0.047). Mean operative times were similar at 78 minutes (50 to 133) for the in situ urethroplasty group vs 70 minutes (51 to 92) for the Foley catheter only group (p = 0.39). Those treated with in situ urethroplasty underwent significantly fewer procedures per patient before artificial urinary sphincter replacement (0.4 vs 1.1, p = 0.004) and had a much higher rate of eventually undergoing secondary artificial urinary sphincter implantation (7 of 13, 54% vs 2 of 13, 15%, p = 0.04) compared to those with cuff erosion treated with Foley catheter only. Conclusions Urethral repair at the time of artificial urinary sphincter explantation for cuff erosion appears to prevent stricture development, thus facilitating successful artificial urinary sphincter replacement. [ABSTRACT FROM AUTHOR]

Purpose: We recently demonstrated that radiotherapy induced urethral strictures can be successfully managed with urethroplasty. We increased size and followup in our multi-institutional cohort, and evaluated excision and primary anastomosis as treatment for radiotherapy induced urethral strictures. Materials and Methods: A retrospective review was performed of 72 patients from 3 academic institutions treated for radiotherapy induced bulbomembranous strictures. Outcome parameters of successful repair included recurrence, incontinence and erectile dysfunction. Results: Among the 72 men treated for radiotherapy induced strictures 66 (91.7%) underwent excision and primary anastomosis. Mean followup was 3.5 years (median 3.1, range 0.8 to 11.2). Prostate cancer was the most common reason for radiotherapy (in 64 of 66, 96.9%). External beam radiotherapy and brachytherapy were performed in 28 of 66 men (42.4%) each, and a combination of both was performed in 9 (13.6%). Mean time from radiation to excision and primary anastomosis was 6.4 years (range 1 to 20) and mean stricture length was 2.3 cm (range 1 to 6). Successful reconstruction was achieved in 46 men (69.7%). Mean time to recurrence was 10.2 months (range 1 to 64) with new onset of incontinence observed in 12 men (18.5%). This was associated with stricture length greater than 2 cm (p = 0.013) and treatment center (p <0.001). The rate of erectile dysfunction remained stable (preoperative 45.6%, postoperative 50.9%, p = 0.71). Radiotherapy type did not affect stricture length (p = 0.41), recurrence risk (p = 0.91), postoperative incontinence (p = 0.88) or erectile dysfunction (p = 0.53). Conclusions: Radiotherapy induced bulbomembranous urethral strictures can be successfully managed with excision and primary anastomosis. Substitution urethroplasty with graft or flap is needed infrequently. Patients should be counseled on the potential risks of urinary incontinence and erectile dysfunction. [Copyright &y& Elsevier]

Purpose: We assessed patient perceptions of regular intermittent self-dilation in men with urethral stricture. Materials and Methods: We constructed and distributed a visual analog questionnaire to evaluate intermittent self-dilation via catheterization by men referred for urethral stricture management at a total of 4 institutions. Items assessed included patient duration, frequency, difficulty and pain associated with intermittent self-dilation as well as interference of intermittent self-dilation with daily activity. The primary outcome was patient perceived quality of life. Multivariate analysis was performed to assess factors that affected this outcome. Results: Included in the study were 85 patients with a median age of 68 years, a median of 3.0 years on intermittent self-dilation and a median frequency of 1 dilation per day. On a 1 to 10 scale the median intermittent self-dilation difficulty was 5.0 ± 2.7, the median pain score was 3.0 ± 2.7 and median interference with daily life was 2.0 ± 1.3. Overall quality of life in patients with stricture was poor (median score 7.0 ± 2.6 with poor quality of life defined as 7 or greater). On univariate analysis younger age (p <0.01), interference (p = 0.03), pain (p <0.01) and difficulty performing intermittent self-dilation (p = 0.03) correlated with poor quality of life in a statistically significant manner. On multivariate analysis only difficulty catheterizing (p <0.01) and younger age (p = 0.05) were statistically significant predictors. Patients with stricture involving the posterior urethra had a statistically significant increase in difficulty and decrease in quality of life (each p = 0.04). Conclusions: Most patients with urethral stricture who are on intermittent self-dilation rate difficulty and pain as moderate, and inconvenience as low but report poor quality of life. [ABSTRACT FROM AUTHOR]

Purpose: We propose a novel risk stratified followup protocol for use after urethroplasty and explore potential cost savings. Materials and Methods: Decision analysis was performed comparing a symptom based, risk stratified protocol for patients undergoing excision and primary anastomosis urethroplasty vs a standard regimen of close followup for urethroplasty. Model assumptions included that excision and primary anastomosis has a 94% success rate, 11% of patients with successful urethroplasty had persistent lower urinary tract symptoms requiring cystoscopic evaluation, patients in whom treatment failed undergo urethrotomy and patients with recurrence on symptom based surveillance have a delayed diagnosis requiring suprapubic tube drainage. The Nationwide Inpatient Sample from 2010 was queried to identify the number of urethroplasties performed per year in the United States. Costs were obtained based on Medicare reimbursement rates. Results: The 5-year cost of a symptom based, risk stratified followup protocol is $430 per patient vs $2,827 per patient using standard close followup practice. An estimated 7,761 urethroplasties were performed in the United States in 2010. Assuming that 60% were excision and primary anastomosis, and with more than 5 years of followup, the risk stratified protocol was projected to yield an estimated savings of $11,165,130. Sensitivity analysis showed that the symptom based, risk stratified followup protocol was far more cost-effective than standard close followup in all settings. Less than 1% of patients would be expected to have an asymptomatic recurrence using the risk stratified followup protocol. Conclusions: A risk stratified, symptom based approach to urethroplasty followup would produce a significant reduction in health care costs while decreasing unnecessary followup visits, invasive testing and radiation exposure. [ABSTRACT FROM AUTHOR]

Purpose: We present patient reported outcomes from our 5-year experience using penile plication to correct a wide variety of Peyronie disease malformations. Materials and Methods: We reviewed the records of all men who underwent penile plication for Peyronie disease, as performed by one of us (AFM). All patients were treated with tunical plication without penile degloving via a 2 cm longitudinal penile incision regardless of curvature severity or erectile function. A concomitant inflatable penile prosthesis was placed in men with refractory erectile dysfunction. A questionnaire was administered to assess the patient perception of postoperative penile curvature, length, rigidity and adequacy for intercourse. Results: Of 154 treated patients 78 (51%) and 65 (42%) had simple (less than 60 degrees) and complex (biplanar curvature, or curvature 60 degrees or greater) malformation, respectively, while 11 (7%) underwent plication plus inflatable penile prosthesis placement. A total of 132 patients responded to the questionnaire a mean 14 months after surgery. Overall, 96% of patients reported curvature improvement after penile plication, 93% reported erection adequate for sexual intercourse and 95% considered that the overall condition improved after surgery. Despite a significant difference in the number of plication sutures (mean 10 vs 7) and curvature angle correction (mean 57 vs 30 degrees, each p <0.005), self-reported outcomes of complex cases were equivalent to those of simple cases. While 84% of patients had no measureable decrease in stretched penile length, 103 of 154 (78%) reported a perceived penile length reduction after surgery. Conclusions: Penile plication without degloving is effective for correcting a wide variety of Peyronie disease malformations. It can be safely combined with inflatable penile prosthesis placement. [ABSTRACT FROM AUTHOR]

Purpose: We examined the association of previous transurethral manipulation with stricture complexity and disease duration among men referred for bulbar urethral reconstruction. Materials and Methods: We retrospectively reviewed the records of 340 consecutive urethroplasties performed by a single surgeon between July 2007 and October 2010. Only men treated with initial open surgery for bulbar strictures were included in analysis, thus excluding those with hypospadias, lichen sclerosus, pelvic radiation, prior urethroplasty, incomplete data, or pure penile or posterior urethral stenosis. Cases were divided into 2 groups based on the history of transurethral treatment for urethral stricture before urethroplasty, including group 1—0 or 1 and group 2—2 or greater treatments. Results: Of 101 patients with bulbar urethral stricture and all data available 50 and 51 underwent 0 to 1 and 2 or greater previous transurethral treatments, respectively. Repeat transurethral manipulation was strongly associated with longer strictures and the need for complex reconstruction. Repeat transurethral manipulation of bulbar urethral strictures was also associated with an eightfold increase in disease duration between stricture diagnosis and curative urethroplasty. Conclusions: Repeat transurethral manipulation of bulbar strictures is associated with increased stricture complexity and a marked delay to curative urethroplasty. [Copyright &y& Elsevier]

Purpose: We report our initial clinical experience with the new 3.5 cm artificial urinary sphincter cuff. Materials and Methods: We reviewed the records of all men who underwent artificial urinary sphincter placement done by a single surgeon since September 2009. A perineal approach was used to ensure cuff placement around the most proximal corpus spongiosum after precise spongiosal measurement with a redesigned measuring tape. Clinical factors and cuff sizes were analyzed. Results: During the 14-month study period 45 of 67 patients (67%) with an artificial urinary sphincter received the 3.5 cm cuff with no difference between primary and revision surgery (73% vs 58%, p = 0.29). Transcorporal cuff placement was reserved for 8 select patients (12%) after prior artificial urinary sphincter cuff erosion or complex urethroplasty. A tandem cuff artificial urinary sphincter was not used. Erectile dysfunction (89% vs 77%, p = 0.28) and prior radiation (47% vs 27%, p = 0.12) were more common in men who received a 3.5 vs a 4.0 cm or greater cuff. A similar proportion of men with a 3.5 cm vs a larger cuff (4 of 45 or 9% vs 2 of 22 or 9%) required explantation for infection and/or erosion. Conclusions: At our center the 3.5 cm cuff has become the predominant size used for primary and revision artificial urinary sphincter placement. Liberal use of the 3.5 cm cuff has simplified and improved artificial urinary sphincter placement without additional morbidity. [ABSTRACT FROM AUTHOR]

Purpose: We defined the role of the Boari bladder flap procedure with or without downward nephropexy for proximal vs distal ureteral strictures. Materials and Methods: We retrospectively reviewed the records of all patients who underwent open ureteral reconstruction for refractory ureteral strictures, as done by a single surgeon between 2007 and 2010. Patients were grouped by stricture site into group 1—proximal third of the ureter and group 2—distal two-thirds. Operative techniques and outcomes were reviewed. Results: During the 30-month study period a total of 29 ureteral reconstruction procedures were performed on 27 patients. A Boari bladder flap was used in 10 of the 12 patients (83%) in group 1 and 10 of the 17 (59%) in group 2. Concomitant downward nephropexy was done more commonly in group 1 (58% vs 12%, p = 0.014). At a mean followup of 11.4 months there was no difference in the overall failure rate between groups 1 and 2 (17% vs 12%). Complications developed more frequently in group 1 (75% vs 35%, p = 0.060), hospital stay was longer (mean 8.0 vs 4.4 days, p = 0.017) and mean estimated blood loss was greater (447 vs 224 ml, p = 0.008). Conclusions: The Boari bladder flap procedure is a reliable technique to reconstruct ureteral strictures regardless of site. Renal mobilization with downward nephropexy is a useful adjunctive maneuver for proximal strictures. [Copyright &y& Elsevier]

Purpose: Radiotherapy induced urethral strictures are often difficult to manage due to proximal location, compromised vascular supply and poor wound healing. To determine the success of urethroplasty for radiation induced strictures we performed a multi-institutional review of men who underwent urethroplasty for urethral obstruction. Materials and Methods: A total of 30 men (mean age 67 years) underwent urethroplasty at 3 separate institutions. Excision with primary anastomosis was used in 24 of 30 patients (80%), with 4 of 30 requiring a genital fasciocutaneous skin flap and 2 a buccal graft. Hospitalization was less than 23 hours for 70% of the patients. Recurrence was defined as cystoscopic identification of urethral narrowing to less than 16Fr in diameter. Results: All strictures were located in the bulbomembranous region. Mean stricture length was 2.9 cm (range 1.5 to 7). External beam radiotherapy for prostate cancer was the etiology of stricture disease in 15 men (50%), with brachytherapy in 7 (24%) and a combination of the 2 modalities in 8 (26%). Successful urethral reconstruction was achieved in 22 men (73%) at a mean of 21 months. Mean time to stricture recurrence was 5.1 months (range 2 to 8). Two men required balloon dilation after stricture recurrence and none required urinary diversion. Incontinence was transient in 10% and persistent in 40%, with 13% requiring an artificial urinary sphincter. The rate of erectile dysfunction was unchanged following urethroplasty (47% preoperative, 50% postoperative). Conclusions: Urethroplasty for radiation induced strictures has an acceptable rate of success and can be performed without tissue transfer techniques in most cases. Almost half of men will experience some degree of incontinence as a result of surgery but erectile function appears to be preserved. [ABSTRACT FROM AUTHOR]

Purpose: We compared our experience with the reconstruction of proximal vs distal bulbar stricture to assess the role of excision and primary anastomosis vs graft procedures at each site. Materials and Methods: We reviewed all urethroplasties done by a single surgeon during a 2-year period. Data analyzed included patient history and demographics, operative details, stricture length and site, and clinical outcome. The proximal bulbar urethra was defined as the segment within 5 cm of the membranous urethra and the distal bulb was defined as the adjoining segment extending to the penoscrotal junction. Cases involving the pendulous or posterior urethra were excluded from study. Results: Of 210 urethroplasties from 2007 to 2009, 112 were done for bulbar strictures, including 72 (64%) for proximal bulbar strictures. All 72 cases were treated with excision and primary anastomosis. Median stricture length was 2 cm (range 1 to 5), although 31 of 72 strictures (43%) were of intermediate length (2.5 to 5 cm). Recurrence developed in 1 case (1.4%). Distal bulbar strictures in 40 of the 112 cases (36%) were treated predominantly with substitution urethroplasty in 36 (90%), and with excision and primary anastomosis in 4 (10%). Median stricture length was 3.75 cm (range 1.5 to 20). We noted intermediate length stricture in 18 of 40 cases (45%) and recurrence in 11 (28%). Of intermediate length strictures recurrence was much rarer after excision and primary anastomosis than after graft procedures (1 of 33 or 3.0% vs 6 of 16 or 38%, p <0.05). Conclusions: Location is critical when selecting an appropriate technique for bulbar urethral reconstruction. Excision and primary anastomosis are superior to grafts in the proximal bulb. Grafts are often unnecessary for reconstructing proximal bulbar strictures 5 cm or less. [Copyright &y& Elsevier]

Purpose: We assessed penile and bulbospongiosus measurements to develop a quantitative guide to select the surgical approach (perineal vs transscrotal vs transcorporeal) to artificial urinary sphincter cuff placement. Materials and Methods: We retrospectively reviewed the intraoperative records of 100 men who underwent artificial urinary sphincter placement (43) or anastomotic urethroplasty (57) from February 2008 to June 2009. Correlations between penile (stretched length and circumference at the shaft base) and bulbospongiosus (distal and proximal circumference) measurements were assessed. Cases were analyzed according to 2 penile circumference groups, including group 1—8.0 cm or less and group 2—8.5 or more. Results: Mean proximal bulbospongiosus circumference was uniformly larger than distal bulbospongiosus circumference (4.5 vs 3.9 cm). It was about 50% of the penile shaft circumference (mean 8.9 cm, r = 0.70). In group 1 men the average distal bulbospongiosus circumference was 3.4 cm. They were more likely to undergo transcorporeal artificial urinary sphincter cuff placement than those in group 2, who had an average distal bulbospongiosus circumference of 4.1 cm (8 of 22 or 36% vs 1 of 21 or 5%, OR 11.4). Penile length correlated less robustly with distal and proximal bulbospongiosus circumference (r = 0.39 and 0.43, respectively). Patients with urethroplasty had significantly larger urethral measurements than those with the artificial urinary sphincter (proximal and distal bulbospongiosus circumference 4.9 vs 3.7 and 4.1 vs 3.2, respectively) but were significantly younger (47 vs 67 years), and less likely to have erectile dysfunction (11 of 57 vs 34 of 43) or to have undergone radical prostatectomy (0 of 57 vs 37 of 43). Conclusions: Bulbospongiosus circumference appears to be proportional to penile circumference. The distal bulbospongiosus is uniformly smaller than the proximal bulbospongiosus. The potential need for a perineal or transcorporeal approach to artificial urinary sphincter placement can be anticipated by penile circumference measurements and a combination of clinical factors, such as older patient age, history of radical prostatectomy and impotence. [Copyright &y& Elsevier]

Purpose: We identified computerized tomography findings associated with the need for urgent intervention for hemostasis after traumatic renal injury to update and refine the American Association for the Surgery of Trauma Organ Injury Scale for renal trauma. Materials and Methods: We retrospectively reviewed the records of consecutive patients presenting to our level I trauma center from 1999 to 2008 with American Association for the Surgery of Trauma grades 3 and 4 renal injury. In all patients initial abdominal computerized tomography was done soon after presentation to the emergency department before renal intervention. All images were interpreted by a staff radiologist and urologist blinded to clinical outcomes. Novel radiographic features (perirenal hematoma size, intravascular contrast extravasation and renal laceration site) were analyzed and correlated with the invasive intervention rate to control life threatening bleeding. Results: Of 299 patients hospitalized with renal injury 102 met study inclusion criteria. Increased perirenal hematoma size (perirenal hematoma rim distance greater than 3.5 cm), intravascular contrast extravasation and a medial renal laceration site were important radiographic risk factors significantly associated with intervention for bleeding after renal trauma. Analyzing these radiographic characteristics collectively showed that patients with 0 or 1 risk factor were at 7.1% risk for intervention and those with 2 or 3 were at remarkably higher risk, that is 66.7% (OR 26.0, 95% CI 7.20–93.9, p <0.0001). Conclusions: On radiography a large perirenal hematoma, intravascular contrast extravasation and medial renal laceration are important risk factors associated with the need for urgent hemostatic intervention after renal trauma. Assessing these computerized tomography characteristics collectively shows that American Association for the Surgery of Trauma grade 4 renal injuries can and should be substratified into grades 4a (low risk) and 4b (high risk). [Copyright &y& Elsevier]

Purpose: A combination of manual physiotherapy and specific relaxation training effectively treats patients with chronic prostatitis/chronic pelvic pain syndrome. However, little information exists on myofascial trigger points and specific chronic pelvic pain symptoms. We documented relationships between trigger point sites and pain symptoms in men with chronic prostatitis/chronic pelvic pain syndrome. Materials and Methods: We randomly selected a cohort of 72 men who underwent treatment with physiotherapy and relaxation training from 2005 to 2008. Patients self-reported up to 7 pelvic pain sites before treatment and whether palpation of internal and external muscle trigger points reproduced the pain. Fisher''s exact test was used to compare palpation responses, ie referral pain, stratified by reported pain site. Results: Pain sensation at each anatomical site was reproduced by palpating at least 2 of 10 designated trigger points. Furthermore, 5 of 7 painful sites could be reproduced at least 50% of the time (p <0.05). The most prevalent pain sites were the penis in 90.3% of men, the perineum in 77.8% and the rectum in 70.8%. Puborectalis/pubococcygeus and rectus abdominis trigger points reproduced penile pain more than 75% of the time (p <0.01). External oblique muscle palpation elicited suprapubic, testicular and groin pain in at least 80% of the patients at the respective pain sites (p <0.01). Conclusions: This report shows relationships between myofascial trigger points and reported painful sites in men with chronic prostatitis/chronic pelvic pain syndrome. Identifying the site of clusters of trigger points inside and outside the pelvic floor may assist in understanding the role of muscles in this disorder and provide focused therapeutic approaches. [Copyright &y& Elsevier]

Purpose: Chronic pelvic pain in men has a strong relationship with biopsychosocial stress and central nervous system sensitization may incite or perpetuate the pain syndrome. We evaluated patients and asymptomatic controls for psychological factors and neuroendocrine reactivity under provoked acute stress conditions. Materials and Methods: Men with pain (60) and asymptomatic controls (30) completed psychological questionnaires including the Perceived Stress, Beck Anxiety, Type A behavior and Brief Symptom Inventory for distress from symptoms. Hypothalamic-pituitary-adrenal axis function was measured during the Trier Social Stress Test with serum adrenocorticotropin hormone and cortisol reactivity at precise times, before and during acute stress, which consisted of a speech and mental arithmetic task in front of an audience. The Positive and Negative Affective Scale measured the state of emotions. Results: Patients with chronic pelvic pain had significantly more anxiety, perceived stress and a higher profile of global distress in all Brief Symptom Inventory domains (p <0.001), scoring in the 94th vs the 49th percentile for controls (normal population). Patients showed a significantly blunted plasma adrenocorticotropin hormone response curve with a mean total response approximately 30% less vs controls (p = 0.038) but no differences in any cortisol responses. Patients with pelvic pain had less emotional negativity after the test than controls, suggesting differences in cognitive appraisal. Conclusions: Men with pelvic pain have significant disturbances in psychological profiles compared to healthy controls and evidence of altered hypothalamic-pituitary adrenal axis function in response to acute stress. These central nervous system observations may be a consequence of neuropsychological adjustments to chronic pain and modulated by personality. [Copyright &y& Elsevier]

Purpose: We present our experience with the reconstruction of synchronous urethral strictures. Materials and Methods: Of 482 anterior urethroplasties performed by a single surgeon between 1997 and 2008 we identified and reviewed 30 patients who underwent reconstruction for multiple separate strictures. An ascending approach from distal to proximal was used and all repairs were completed at 1 stage. A total of 13 combinations of techniques were used to complete the repairs. A 2-phase technique was used in which the patient remained supine during buccal mucosa harvest and repair of strictures distal to the penoscrotal junction, and was then repositioned into the high lithotomy position as needed for stricture repair in the bulbar urethra. In each case normal intervening urethra was preserved intact. The number, length and location of strictures, operative time and patient outcomes were evaluated. Results: No position related complications occurred during or after surgery despite a mean operative time of 4.5 hours (range 2.5 to 6.4). No infectious wound complications were reported despite repositioning the legs to the high lithotomy position. Three patients (10%) were known to have required treatment for recurrent stricture after surgery. Conclusions: One-stage reconstruction for synchronous urethral strictures may be safely and effectively performed using a systematic, ascending reconstructive approach with creative application of tissue transfer techniques. Decreasing patient time in the high lithotomy position appears to prevent related lower extremity complications. [Copyright &y& Elsevier]

Purpose: Abnormal regulation of the hypothalamic-pituitary-adrenal axis and diurnal cortisol rhythms are associated with several pain and chronic inflammatory conditions. Chronic stress may have a role in the disorder of chronic prostatitis/chronic pelvic pain syndrome related to initiation or exacerbation of the syndrome. We tested the hypothesis that men with chronic pelvic pain syndrome have associated disturbances in psychosocial profiles and hypothalamic-pituitary-adrenal axis function. Materials and Methods: A total of 45 men with chronic pelvic pain syndrome and 20 age matched, asymptomatic controls completed psychometric self-report questionnaires including the Type A personality test, Perceived Stress Scale, Beck Anxiety Inventory and Brief Symptom Inventory for distress from physical symptoms. Saliva samples were collected on 2 consecutive days at 9 specific times with strict reference to time of morning awakening for evaluation of free cortisol, reflecting secretory activity of the hypothalamic-pituitary-adrenal axis. We quantified cortisol variations as the 2-day average slope of the awakening cortisol response and the subsequent diurnal levels. Results: Men with chronic pelvic pain syndrome had more perceived stress and anxiety than controls (p <0.001). Brief Symptom Index scores were significantly increased in all scales (somatization, obsessive/compulsive behavior, depression, anxiety, hostility, interpersonal sensitivity, phobic anxiety, paranoid ideation, psychoticism) for chronic pelvic pain syndrome, and Global Severity Index rank for chronic pelvic pain syndrome was 93rd vs 48th percentile for controls (p <0.0001). Men with chronic pelvic pain syndrome had significantly increased awakening cortisol responses, mean slope of 0.85 vs 0.59 for controls (p <0.05). Conclusions: Men with chronic pelvic pain syndrome scored exceedingly high on all psychosocial variables and showed evidence of dysfunctional hypothalamic-pituitary-adrenal axis function reflected in augmented awakening cortisol responses. Observations suggest variables in biopsychosocial interaction that suggest opportunities for neurophysiological study of relationships of stress and chronic pelvic pain syndrome. [Copyright &y& Elsevier]

Purpose: We reviewed the literature regarding the clinical presentation, etiology, natural history, and medical and surgical management of lichen sclerosus in men. Materials and Methods: We performed a comprehensive search of the literature in PubMed, MEDLINE® and other electronic databases between 1950 and 2006 using the key words lichen sclerosis, balanitis xerotica obliterans and urethral stricture. Our search resulted in 1,268 sources containing the words lichen sclerosus or balanitis xerotica obliterans. We reviewed 68 articles in the peer reviewed journals and 2 chapters on this subject. Results: Lichen sclerosus is a chronic, lymphocyte mediated skin disease that was first described in 1887. It shows a predilection for the anogenital area in men and women. Much has been discovered regarding the epidemiology, natural history and histological features of this disease process during the last century, including the discovery of a strong association between lichen sclerosus and squamous cell carcinoma. The techniques of medical and surgical management of this disorder are still being elucidated. Biopsy of the initial lesion for definitive diagnosis and long-term followup of affected patients are well established, critical elements in the management of lichen sclerosus. Conclusions: Lichen sclerosus is a chronic, debilitating condition that may progress to cause significant voiding complications. Biopsy is recommended in all patients suspected of having lichen sclerosus to rule out squamous cell carcinoma. Further research is needed to improve the prevention, understanding and treatment of this challenging condition. [Copyright &y& Elsevier]

Purpose: We present our combined experience with a simplified posterior urethroplasty technique to determine the necessity and usefulness of ancillary reconstructive maneuvers. Materials and Methods: We reviewed the records of 135 men and 7 boys who underwent reconstruction of traumatic posterior urethral defects with greater than 1 year of followup from 5 tertiary teaching hospitals. Prior treatments, surgical approach and ancillary techniques required during reconstruction were compiled. Results: Direct anastomosis following scar excision and urethral mobilization alone was performed in 95 of the 142 males (67%). Formal corporal splitting was performed in 24 patients (17%) and inferior pubectomy in was done in 14 (10%). Supracrural urethral rerouting was performed in only 4 patients (3%), of whom 3 (75%) experienced recurrent stenosis. Abdominoperineal reconstruction, which was reserved mainly for salvage and pediatric cases, was required to reconstruct complex defects in 5 of the 142 cases (4%) and it was successful in 4 (80%). Early urethral realignment was associated with successful subsequent reconstruction in all patients in whom this maneuver was achieved (17 of 17 or 100%). This maneuver tended to be straightforward. Overall successful posterior urethral reconstruction was achieved in 130 of 142 cases (92%). Eight failures were successfully salvaged by internal urethrotomy (3) or repeat urethroplasty (5). Conclusions: Ancillary maneuvers such as corporal splitting or inferior pubectomy are seldom required for successful posterior urethral reconstruction. Urethral rerouting appears to be inferior to the abdominoperineal approach as a salvage maneuver for complex cases. Primary realignment appears to promote more simplified and successful surgical repair. [Copyright &y& Elsevier]

Purpose: We evaluated the significance of stricture length and severity on the outcome of fossa navicularis reconstruction. We also determined the efficacy and usefulness of an extended meatotomy (first stage Johanson) salvage maneuver in refractory cases. Materials and Methods: Our 7-year experience with the surgical management of distal urethral strictures involving the fossa navicularis was reviewed. Stricture length, reconstructive method and outcomes were assessed in 40 consecutive cases performed at our institution from 1997 to 2003. Men undergoing flap or graft onlay reconstruction were divided into group 1—short, isolated fossa navicularis strictures (2.5 cm or less) and group 2—long pendulous urethral strictures (greater than 2.5 cm) extending into the fossa navicularis. Men treated with extended meatotomy for complex and/or reoperative distal strictures comprised group 3. Results: Average followup was 52 months (range 28 to 81). The majority of men with short isolated fossa navicularis strictures (group 1 average length 2.2 cm, range 1.5 to 2.5) had successful onlay reconstruction (10 of 11, 91%). Those with longer strictures (group 2 average length 7.4 cm, range 4 to 16) had significantly poorer outcomes with onlay reconstruction (7 of 13, 54%, p <0.05). Failures presented in a delayed manner with recurrent stenosis of the distal segment. Extended meatotomy (group 3) proved to be successful in 14 of 16 men (87%) with complex or reoperative strictures. Conclusions: Stricture length influences the outcome of distal urethroplasty. Onlay repair via a penile fasciocutaneous flap technique is reliable for short perimeatal strictures, but is less well suited for longer distal strictures. Extended meatotomy appears to be a highly effective salvage maneuver for complicated strictures of the fossa navicularis. [Copyright &y& Elsevier]

Purpose: The ease of the transscrotal approach for penile prosthesis implantation and the proximity of the urethra has allowed the evolution of a new strategy for dual implantation of an AUS and IPP at a single setting. Concerns regarding increased infection rates and poor outcomes have prevented widespread acceptance of this simultaneous implantation technique. A multi-institutional evaluation of dual prosthesis implantation was performed to determine the overall efficacy, safety and long-term success of this innovative approach. Materials and Methods: We performed a multi-institutional, retrospective analysis in patients with 2 urological prostheses (AUS and IPP). Only patients undergoing dual implantation via a single transscrotal technique were included for evaluation. Comorbidities, infection rates, and intraoperative and postoperative complications were recorded. Results: A total of 22 men underwent AUS and IPP device implantation between 2000 and 2003 in a synchronous manner. Mean followup was 17 months. Complications were urethral erosion in 2 patients (9%) and reservoir migration in 2 (9%), of whom 1 underwent revision. Importantly no patient experienced a prosthetic infection postoperatively. The overall revision rate was 14%, due to urethral erosion of the AUS in 2 patients and reservoir migration in 1. All patients reported urinary leakage requiring 1 pad daily or less. Conclusions: Our initial intermediate followup in patients who underwent synchronous dual prosthetic implantation was favorable. The inherent advantage of a single anesthetic event and a single transscrotal incision should encourage widespread acceptance of this technique. [Copyright &y& Elsevier]

Purpose: We report our initial experience with men who underwent EAU for strictures greater than 2.5 cm involving the proximal bulbar urethra. Materials and Methods: Of the more than 250 men who underwent urethral reconstruction at our institution during 1997 to 2005 a select consecutive group of 22 in whom proximal bulbar urethral strictures were treated with primary bulbomembranous anastomosis were evaluated. Outcomes in men with strictures greater than 2.5 cm long (EAU) were compared to those in men with shorter strictures in the same proximal bulbar location. Cases of post-traumatic urethral disruption related to pelvic fractures were omitted. American Urological Association symptom index scores and erectile function questionnaires were completed more than 6 months postoperatively. Results of a prior study using the same erectile function questionnaire after various types of urethroplasty and circumcision were then compared to those of our series. Results: Patients with EAU had an average stricture length of 3.78 cm (range 2.6 to 5.0) and 10 of 11 procedures (91%) were successful. Anastomotic urethroplasty performed for similar proximal bulbar strictures less than 2.5 cm (mean 1.5, range 1.0 to 2.3) was successful in 10 of 11 cases (91%). Mean followup was 22.1 months and all followups were more than 1 year. Men treated with EAU had no increased rate of stricture recurrence or erectile complaints compared to men in whom shorter proximal bulbar strictures were repaired using an identical surgical technique. Similarly no increased rate of erectile problems was identified compared to other types of urethroplasty and circumcision using an identical questionnaire. Conclusions: Urethral reconstructability is proportional to the length and elasticity of the distal urethral segment. Defects up to 5 cm may be successfully excised and primarily reconstructed in select young men with proximal bulbar strictures. [Copyright &y& Elsevier]

Purpose: In the last year TO slings have become an increasingly popular alternative to TA slings for the surgical treatment of SUI. Proposed advantages of the transobturator approach include improved speed, safety and the reduction of obstructive complications. We assessed outcomes of TO and TA slings in a large series of women treated at several institutions to compare the rate of obstructive complications from these procedures. Materials and Methods: We reviewed the charts of 504 consecutive women who had synthetic mid urethral sling procedures (154 TO or 350 TA) performed by 24 different urologists for SUI at 8 institutions from 2002 to 2004. Obstructive complications were defined as increased PVR (greater than 100 cc), or the need for CIC, prolonged Foley catheter drainage or urethrolysis. Results: While TO and TA sling procedures appeared to be similarly efficacious in eliminating the need for incontinence pad use (TO 89%, TA 86%, p = 0.36), the transobturator approach was associated with fewer obstructive complications (TO 11.0%, TA 18.3%, p <0.05). Urethrolysis was required in none of the 154 TO cases and 8 of 350 (2.3%) TA cases. Concomitant pelvic surgery did not significantly increase the likelihood of obstructive voiding complications in either group. Conclusions: Although TO and TA sling procedures had similar short-term results for decreasing pad use in patients with stress urinary incontinence, the transobturator approach is associated with fewer obstructive voiding complications. [Copyright &y& Elsevier]

Purpose: Descriptions of posterior urethral penetrating injuries are rare in the literature and their management is poorly described. We reviewed the medical records of 19 men who sustained posterior urethral gunshot wounds and report our experience with various treatment options. Materials and Methods: We retrospectively reviewed the records of 19 men (mean age 27 years) who sustained posterior urethral gunshot wound injuries confirmed by retrograde urethrography and/or exploratory laparotomy. Treatment options included immediate primary repair in 2 patients, delayed reconstruction in 15 and complete prostatectomy in 2. Outcomes were described by flow rates and lower urinary tract symptoms. Results: Of 15 patients who underwent delayed repair 13 (86.6%) demonstrated normal flow rates and lack of lower urinary tract symptoms. The 2 remaining patients experienced obliterative stricture recurrences and were treated with open surgery. Both patients who underwent immediate primary repair had normal flow rates. Of the 2 men who underwent immediate prostatectomy 1 had moderate incontinence requiring absorbent pad use and the other was lost to followup after he was discharged home with a suprapubic catheter in place. Conclusions: An initial management strategy based on the principles of maximizing urinary catheter drainage, with direct retropubic repair/urethral realignment when possible and definitive perineal reconstruction when necessary, appears to provide acceptable outcomes while minimizing the number of subsequent interventions required. [Copyright &y& Elsevier]