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Resumen Introduccion Dentro del diagnostico diferencial de la hematuria en pacientes receptores de un trasplante de medula osea (T.M.O.) debemos considerar la cistitis hemorragica por poliomavirus BK y JC. Algunos han implicado al virus BK como el principal agente en su desarrollo. La viruria por BK tambien se ha asociado a estenosis ureteral en pacientes sometidos a trasplante renal. Las infecciones urinarias virales, excepcionales cuando existe indemnidad del sistema inmune, pueden aparecer con frecuencia en situaciones de inmunocom-promiso. Material y metodos Estudio retrospectivo de 123 pacientes consecutivos sometidos a trasplante de medula osea (1995-2000), analizando los casos en que se presento cistitis hemorragica con aislamiento de poliomavirus BK y JC en orina. Se estudian: caracteristicas poblacionales, enfermedad de base, manifestaciones clinicas y radiologicas, metodos diagnosticos y medidas terapeuticas. Realizamos una revision de los principales aspectos de estos “desconocidos huespedes del aparato urinario”. Resultados Se presento cistitis hemorragica asociada a poliomavirus en 7 casos (5,7% de los TMO), 6 por BK y 1 por JC. Corresponden a 3 varones y 4 mujeres, con una edad media de 29 anos (14-45). Todos los pacientes con urocultivos bacteriologicos, micoticos y parasitologicos negativos. Presentacion clinica como hematuria macroscopica en todos los casos (aparicion entre los dias +30 y +132 post-trasplante), cuya duracion oscilo entre 3 y 30 dias. En 6 casos existian criterios de Enfermedad de Injerto Contra Huesped. Ecograficamente, en 5 pacientes se evidencio un engrosamiento difuso de la pared vesical. En todos se instauro tratamiento mediante hiperhidratacion, sondaje vesical y extraccion de coagulos, lavado endovesical continuo, alcalinizacion urinaria y antivirales sistemicos. No fueron necesarias actuaciones mas agresivas. Como complicacion, un caso de insuficiencia renal leve, reversible. Comentarios La cistitis hemorragica por poliomavirus es una entidad que considerar en pacientes que han recibido un T.M.O., debiendo realizar diagnostico diferencial ante toda hematuria que se presente en estos casos. Es necesario un adecuado manejo urologico de la hematuria, que puede llegar a comprometer la vida del paciente.

We report a case of neoplasm of the urinary bladder with pseudosarcomatous stromal differentiation. Heterologous carcinosarcomas are extremely rare malignant neoplasms (seventy-eight cases have been previously described). This is a case of carcinoma containing numerous osteoclast type giant cells that stained for vinmentin and acid phosphatase and were negative for cytokeratin and lysozyme.

Presentamos un caso de tumor vesical con diferenciación pseudosarcomatosa del estroma. Son extremadamente raros (sólo se había descrito 78 casos en el mundo hasta el año 2001). También son llamados carcinosarcomas heterólogos, dentro de los cuales se encuentran los llamados carcinosarcomas con células gigantes tipo osteoclasto, que se caracterizan por ser positivos para vimentina y fosfatasa ácida y negativos para marcadores epiteliales (citoqueratinas de bajo peso y lisozima). We report a case of neoplasm of the urinary bladder with pseudosarcomatous stromal differentiation. Heterologous carcinosarcomas are extremly rare malignant neoplasms (seventy-eight cases have been previonsly described). This is a case of carcinoma containing numerous osteoclast type giant cells that stained for vinmentin and acid phosphatose and were negative for cytokeratin and lysozyme.

Presentamos un caso de tumor vesical con diferenciación pseudosarcomatosa del estroma. Son extremadamente raros (sólo se había descrito 78 casos en el mundo hasta el año 2001). También son llamados carcinosarcomas heterólogos, dentro de los cuales se encuentran los llamados carcinosarcomas con células gigantes tipo osteoclasto, que se caracterizan por ser positivos para vimentina y fosfatasa ácida y negativos para marcadores epiteliales (citoqueratinas de bajo peso y lisozima).

To evaluate P 53 and c-erb-2 overexpression as a prognostic factor for progression and survival in patients with renal pelvis and ureter tumors.Retrospective review of the medical records and pathology/immunohistochemical reports of 61 patients who underwent surgery for upper urinary tract urothelial tumors. Immunohistochemical studies were performed using the STREPTAVIDIN-BIOTIN-PEROXIDASE techniques with a LASAB kit (DAKO). Pearson's Chi square for 2 x 2 contingency tables and residues analysis were used for non continuous variables, with a confidence level of p0.05. COX multivariate analysis and survival curves were used for multiple variables association.A higher P 53 overexpression was related with tumour dependent death (p0.001). These patients have their long term survival compromised. C-erb-2 overexpression is not statistically related to either proliferation or cancer specific death in upper urinary tract urothelial tumors.In our series P53 overexpression has prognostic value in upper urinary tract urothelial tumors, but c-erb-2 did has not prognostic value.

To present a case of urothelial tumor inside a simple ureterocele with a coexisting contralateral tumor that caused bilateral obstructive uropathy.Follow-up evaluation of a 74-year-old male patient with superficial tumor of the urinary bladder diagnosed 4 years earlier, revealed renal failure and bilateral obstructive uropathy. The complementary tests showed a simple left ureterocele containing a lesion suggestive of a tumor and a right ureteral tumor.After biopsy confirmed coexisting urothelial disease at 3 levels (intraureterocele, contralateral ureter and in situ carcinoma of the bladder), the patient was submitted to cystoprostatectomy, nephroureterectomy and en bloc segmental ureterectomy.Multicentric synchronous urothelial tumors warrant a close and long follow-up of the entire urinary tract. Among the possible sites of presentation, few cases of tumors inside a ureterocele have been reported. The case described herein, with this uncommon site of presentation, is an example of panurothelial disease.

To report a case of urothelial tumor of the bladder in a 17-year-old patient that required emergency surgical treatment due to acute hematuria.The clinical history, anatomopathological and immunohistochemical findings are described.A 17-year-old patient with no remarkable clinical history, consulted at the emergency services for gross hematuria of sudden onset that caused anemia and was refractory to conservative management. Patient evaluation disclosed a bladder lesion that required immediate resection via the transurethral approach to control bleeding. The pathological analysis demonstrated a grade I, Jewett stage 0, pTaN0M0 transitional cell carcinoma of the bladder.Urothelial tumors of the bladder are uncommon in patients less than 40 years old. The case described herein is uncommon because of the patient's age and the form of presentation of the tumor, which required emergency surgical treatment. Follow-up and subsequent therapy should be based on the pathological characteristics of the tumor rather the age of the patient.

To describe two cases of symptomatic syringocele diagnosed in adult patients.Two cases of symptomatic syringocele diagnosed in adult patients that both consulted for obstructive voiding syndrome, are described. Diagnosis was made by retrograde urethrography. An incision extending to the outlet of the syringocele was performed in both cases. Good results were achieved and the symptoms remitted.Syringocele is the cystic dilatation of Cowper's gland. It is generally congenital and a majority of the symptomatic cases (urinary infection, obstruction or hematuria) are diagnosed in childhood. The diagnosis is based on the findings of retrograde urethrography and urethroscopy. Treatment is by urethroscopic incision or marsupialization of the syringocele. Some cases may require open surgery via the perineal approach.

Differential diagnosis of hematuria after bone marrow transplantation (B.M.T.) may include polyomavirus (BK and JC)-associated haemorrhagic cystitis. Many reports have implied BK virus as the major pathogen in the development of hemorrhagic cystitis after BMT. BK viruria is also associated with ureteric stenosis in renal allografts recipients. Viral urinary tract infections are uncommon in healthy individuals, but we can find them frequently in patients under immunosuppressive conditions.Retrospective study of 123 consecutive B.M.T. recipients in the period from 1995 to 2000, evaluating those with polyomavirus-associated hemorrhagic cystitis. We present patient's characteristics, primary disease, clinical features, diagnosis aspects and treatment of these "hidden hosts of urinary tract".7 patients (5.7% of B.M.T.) developed BK or JC virus-associated hemorrhagic cystitis; 3 men and 4 women; median patient age was 29 years (range 14 to 45 years). Bacterial, mycobacterial and parasitic urine cultivates had negative results in all of them. The clinical course was characterized by a late onset of haemorrhagic cystitis (days +30 to +132 after BMT). All 7 patients developed macroscopic haematuria (duration 3 to 30 days). In 6 cases Graft Versus Host Disease (G.V.H.D.) criteria were found. Ultrasonographic studies revealed diffuse thickening of bladder wall in 5 patients. Hematuria was managed by hyperhydratation, blood transfusions, transurethral catheter and evacuation of blood clots, continuous bladder irrigation, urine alkalinization and antiviral therapy. No other more aggressive measures were required to stop the bleeding. Only 1 case of transient elevated creatinine.Polyomavirus-associated haemorrhagic cystitis must be considered in differential diagnosis of hematuria in bone marrow transplantation recipients. Urological management, according with the severity and duration of hematuria, is frequently required.

One of the basic characteristics of urothelial carcinoma is its tendency to synchronous or metachronous multifocality. Thus the need to explore the entire urinary tract of patients with urothelial neoformations. The aim of this article is to study the tumors of the upper urinary tract that appear synchronously with infiltrating carcinoma of the bladder. The clinicopathological characteristics and the morbidity and mortality of en bloc surgery of both tumors are analyzed.A retrospective study was carried out on 170 radical cystectomies for infiltrating bladder tumor performed in our department over a 13-year period. Patient history, clinicopathological characteristics, complementary tests, type of surgery performed, postoperative complications and follow-up were analyzed.Tumor of the upper urinary tract appeared in 14 (1 bilateral) of these patients and were synchronous in 10 cases. All patients were male; mean age 63 years. Three were localized in the pelvis, 2 in the proximal ureter and 6 in the distal third. Diagnosis was made by IVP in 6 patients and by US and antegrade pyelography in the other 4 patients. Nephroureterectomy and radical cystectomy were performed en bloc in 8 cases; 6 had a Bricker procedure and 2 ileal substitution. Salvage radical cystectomy + distal ureterectomy were performed in the other two patients. Two patients submitted to en bloc surgery had postoperative complications; one presented prolonged ileua and the other required surgery for retroperitoneal hemorrhage. The two patients submitted to palliative surgery died of and sepsis during the postoperative period. At 33 months' mean follow-up, 3 patients have shown tumor progression.There is a high proportion of synchronous tumor of the upper urinary tract in our series of patients with infiltrating carcinoma of the bladder undergoing radical cystectomy, therefore we consider it necessary to explore the entire urinary system. Surgical removal of both tumors en bloc does not increase the morbidity and mortality.

To present an additional case of mucinous adenocarcinoma of the prostate gland. The histochemical and immunohistochemical findings demonstrating its prostatic origin are presented and the literature is reviewed.A 53-year-old male with no previous symptoms or signs presented for a prostatic examination. DRE was normal and PSA was 35 ng/ml. A prostate biopsy demonstrated adenocarcinoma of the prostate with a Gleason score of 3 + 3. Complementary studies were negative. The patient was submitted to radical prostatectomy. Anatomopathological analysis of the surgical specimen demonstrated a prostatic mucinous adenocarcinoma. At one-year follow-up, the patient is alive and disease-free and PSA values have returned to normal.Mucinous adenocarcinoma of the prostate is a rare anatomopathological variant whose natural history and prognosis are not well-known. This tumor type generally does not respond to any treatment and is hormone-resistant.

Vaginal stones are rare. We can classify them as primary or secondary, depending on the presence or the absencse of a foreign body nidus. Various cases can led to stone formation. Most of them developed in women with a vesicovaginal or urethrovaginal fistula, as well as in patients with congenital anomalies of the genitourinary tract, previous pelvic radiotherapy, neuropathic bladder and other different causes of vaginal outlet obstruction. Secondary vaginal stones, formed around foreign bodies, are not so frequent. Radiological examination and urethro-vaginoscopy make easy the right diagnosis. Sometimes the stone may be fragmented by lithotripsy before the extraction. The associated etiology should be treated concomitantly in order to prevent recurrence. We report a case of primary vaginal stone associated with an urethrovaginal fistula in a 25 years old women and a review of the related literature.

Juvenile gangrenous vasculitis of the scrotum is a peculiar form of scrotal gangrene of undetermined etiology, with clinical and pathological features of its own, described in 1973 by Piñol et al. We report a new case, considering this entity as part of the differential diagnosis of scrotal gangrene, and a review of relative literature.

Four additional cases of malignant priapism or priapism secondary to penile metastasis from urogenital tumors are presented and the literature is reviewed.Chest and abdominal radiological evaluation, cavernosal and abdominal US, abdominal and pelvic CT and MRI, and cavernosal biopsy were performed for the localization and staging of the primary tumor.Conservative palliative management achieved a survival of only a few months in three of the patients with tumor dissemination to adjacent vital organs. Radical surgery was performed in one patient with tumor localized to the genital area. Currently, this patient has no clinical symptoms, although the follow-up is only 4 months.Malignant priapism is rare and usually secondary to GU tumors. The prognosis is poor since it generally indicates the presence of multiorgan metastasis. However, the prognosis is better for single metastasis, which is an indication for radical surgery.

To present three illustrative cases of pyeloureteritis cystica and review the literature.Three illustrative cases diagnosed at our department are described. Patient history, clinical features, diagnostic procedures and treatment are analyzed and the literature is reviewed.Our patients had no specific symptoms. All three patients had urinary tract infection with pyeloureteral involvement, which was bilateral in two cases. One of these patients had a long-indwelling catheter.Pyeloureteritis cystica is a benign and uncommon condition whose etiology is not well-known. It is generally associated with chronic infection and inflammation, and may be difficult to distinguish from other filling defects of the urinary tract. Due to its benign nature, treatment must always be conservative and close follow-up is recommended.

Trigonocervicotomy is a barely invasive technique for the treatment of infravesical obstruction, first introduced in the 60's by Turner-Warkic and Orandi. To achieve good results with this procedure, the selection criteria must take into account a series of parameters such as age, sexual activity, PSA, prostate weight (below 30 grams) and others. In addition to its low morbidity, a larger percentage of patients preserve ejaculation than with the use of other techniques, also the neck sclerosis rate being lower as seen in all our series and expertise. The efficacy of this technique was studied on 100 patients.

Presentation of eight cases of urinary candidiasis in patients who underwent radical cystectomy and were managed using by-pass of the urinary tract, oral antifungal therapy and solutions in the way of intermittent instillation through nephrostomy catheters.

Analysis of the infiltrant tumours of the bladder diagnosed in our service between 1986-1996 both inclusive, with associated tumour of the upper tract during its evolution. From a total of 262 infiltrant transitional tumours of the bladder and 52 transitional tumours of the upper urinary tract, 8 patients were found to have both types of tumours in association, which accounted for 3.05% of all infiltrant vesical tumours. Mean age of our patients, all male, was 65. The pathological anatomy of the upper tract tumours was: 4 pT1 and 4 pT3. 75% presented relapsing tumours of the bladder, 50% had a background of bladder Cys, 87.5% were multifocal vesical tumours and 100% were larger than 3 cm. In addition, 62% cases were ipsilateral to the tumours of the upper urinary tract. It can therefore be concluded that for tumours of the bladder, multifocality, relapse, presence of vesical Cys and tumour size, are all concurring features when association of these two types of tumours occurs.

A series of 60 cases of tumours of the Upper Urinary Tract (UUT) diagnosed in our centre between 1987-1996 and affecting 57 patients is presented. Patient's mean age was 63.7 years, males being clearly predominant, 4:1, there was no predominant laterality and the preferential location was the renal pelvis. Fifty-two (52) out of all tumours were transitional, 1 was a fibroepithelial polyp and 2 were metastasis from prostate and colon cancers. Pathoanatomy of the remaining cases is not known since no surgery was performed, although the cytologic diagnosis has identified them as transitional tumours. Our series shows a significant association to other transitional tumours as demonstrated by the existence of 2 cases with a background of UUT tumours and other 31 cases associated to transitional tumour of the bladder. Haematuria was the predominant sign (54%) and UIV the leading examination technique. Nephroureterectomy was the most commonly used therapeutical approach. UUT appear to be highly predominant in our environment, with a clear male predominance and preferential location in the renal pelvis. Haematuria continues to be the most frequent presentation sign and UIV the exploratory technique offering better performance in the diagnosis. Also a high association was found to other types of transitional tumours, the diagnosis and follow up of which allowed us to diagnose a large number of tumours of the upper tract.

To analyze the association of congenital bilateral agenesis of the vas deferens and cystic fibrosis.Three azoospermic patients with surgically confirmed congenital agenesis of the vas deferens in whom a molecular genetics study had been performed to discard the more common mutations of cystic fibrosis are described and the literature reviewed.All patients showed azoospermia. The molecular genetics study showed one of the patients to be a heterozygotic carrier of G542X and no other mutations like the remaining patients.15% of patients with azoospermia have chromosomal anomalies. Recently, it has been reported that 50%-65% of patients with congenital bilateral agenesis of the vas deferens have mutations for the CFTR gene, with more than 400 reported. Patients with bilateral agenesis and their partners should be screened for cystic fibrosis prior to any in vitro fertilization techniques.

Presentation of one patient with a highly infrequent association of transitional cells carcinoma and renal cells adenocarcinoma synchronically developed in the same renal unit. There has been very few cases diagnosed up to now, and only around 25 have been described in the literature. There is a clear predominance of males versus females, with haematuria being the most frequent sign present in 90% cases. Elective complementary examination is CT and the choice treatment can be either nephroureterectomy or extended nephrectomy based on early suspicion of transitional cells carcinoma or renal cells adenocarcinoma.

The infection caused by the Human Immunodeficiency Virus (HIV), a retrovirus, leads to a progressive decline and to the suppression of cell-mediated immunity favouring the development of opportunistic diseases and potentially fatal neoplasias which are practically innocuous in individuals with an intact immunologic system. The number of AIDS cases recorded in Spain until March 1997 was 45,132, with a revised mortality rate of 58%. Cases in Murcia total 713 up to October 1997, of which 217 patients are being monitored in the AIDS Unit in our centre, 414 individuals have died in the region. It is well know that about one third of patients with diagnosed AIDS or who are HIV carriers will develop some type of genitourinary lesion, either as a result of a renal disorder, concurrent or not with HIV, or any other condition directly related to the infection. This is a report on our Service's experience in the treatment of HIV patients with genitourinary symptoms that, in a total of 15 cases, required our intervention. Emphasis is placed on the incidence of nephrolithiasis secondary to therapy with protease inhibitors over the last few months following introduction of this new therapeutic tool, prostatitis due to salmonella, and inlaid cystitis among others.

To analyze the incidence of non-urothelial neoplasms in patients with infiltrating bladder tumor submitted to radical surgery.A retrospective study was conducted in patients who underwent radical cystoprostatectomy for an infiltrating bladder tumor from 1987-1996. The pathological and follow-up data were analyzed.Of 120 patients submitted to radical cystoprostatectomy for an infiltrating bladder tumor, 23 (19%) had an associated non-urothelial neoplasm: 14 (61%) were metachronous and 9 (39%) were synchronous. Two patients had two secondary tumors (9%).We have found a high incidence of non-urothelial tumor in patients with infiltrating bladder tumor. By order of frequency, these were prostate cancer, gastrointestinal cancer, pulmonary cancer, etc. Studies have ascribed the association of prostate and bladder cancer to the deletion of suppressor genes.

Vesical inverted papilloma (IP) is a transitional disease most commonly found in the bladder, representing a small percentage within the group of vesical neoformations. Although of benign behaviour, some authors advise that a relatively strict monitoring should be used considering its high rate of proliferative activity. It mainly affects males in their fifth to seventh decade, and it presents as any other transitional tumour. In about one fourth of the cases a transitional carcinoma becomes associated throughout its evolution, thus supporting the theory of periodic monitoring.

Utriculocele is the engrossment of the prostate utricle with occlusion and/or cystic formation, sometimes including the ejaculatory conducts. We report three patients diagnosed with utriculocele with different presentation forms: hypospermia, haematuria and mictional syndrome, and the treatment used. Theories on their formation, clinical presentation forms described in the literature, diagnostic means, most frequent associations, and different therapeutic alternatives are all discussed as well as a revision of the reported cases.

Eosinophilic cystitis (EC) is a clinical-pathological entity characterised by the transmural infiltration of the bladder. It shows as an irritative mictional syndrome, though the most common sign is haematuria. Endoscopically it appears as an intravesical mass and is usually mistaken for a transitional tumour of the bladder. There has been many etiologies involved but not one single factor has been identified as responsible for the condition. Medical approach is the most appropriate initial treatment, but since the condition is so often mistaken with vesical tumoration, the first therapeutical attitude in most cases is Transurethral Resection (TUR) which, though more aggressive, is therapeutic, haemostatic and provides material for the pathoanatomical diagnosis.

Flutamide is a non-steroidal anti-androgen used in the treatment of prostate cancer, usually in combination with LHRH-analogs. Incidence of hepatotoxicity associated to Flutamide in the literature is very low and does not exceed 0.18%. Between February 1989 and December 1994, the FDA was reported 20 cases of patients who had died and 26 who had been hospitalized due to hepatotoxicity secondary to Flutamide. We contribute two cases of patients diagnosed with prostate adenocarcinoma following treatment with flutamide and LHRH-analogs who presented liver failure; one with signs and symptoms of acute hepatitis that recovered after discontinuation of the drug, and a second one who developed micronodular cirrhosis and later died of icteroascitic decompensation and hepatorenal syndrome. Including a review of the literature, the paper comments on the likely biological mechanisms for liver toxicity caused by Flutamide. The authors conclude that clinical and laboratory monitoring of patients who either will receive or are receiving treatment with Flutamide is necessary, and withdrawal of drug imperative as soon as certain symptoms of hepatic dysfunction become apparent.

PSA is currently the best marker in the diagnosis and staging of prostate cancer, although it has a low specificity when trying to distinguish between BPH and prostate cancer. Between January 1994 and December 1995, 243 BPHs were diagnosed after prostate TUR and retropubic adenomectomy. A selection of 131 cases were analyzed based on PSA higher than 4 and normal rectal examination pre-surgery. After surgery PSA was determined again with a time interval from the earlier one ranging between 103-211 days, noting that in about 70% cases PSA levels were normalized and 64% of these also presented focused acute prostatitis, chronic prostatitis, prostate infarction, lithiasis or areas of abscess formation. In spite of a significant number of patients with high PSA levels, this elevation should be interpreted cautiously considering the large percentage of cases where posterior pathological anatomy is a sign of BPH. We believe that among the conditions that could justify such abnormal PSA elevations are those described of areas of chronic or acute prostatitis, prostate infarctions, areas of abscess formation and presence of intraprostate lithiasis.

One of the anomalies affecting the ureter is the blind bifid cranial ureter, which is truly an uncommon alteration. Clinical signs and symptoms are very ambiguous, and sometimes the condition is diagnosed accidentally while conducting an urographic examination. The aim of this paper is simply to contribute a new case to the existing literature.

Presentation of one case of relapsed urethral stenosis in a penoscrotal location where after several failed therapeutical approaches, the final decision was to place a Wallstent endoluminal prothesis. The patient underwent several endoscopic internal urethrotomies and urethroplasty in two occasions, developing complications: urethral calculi, hair follicles requiring cauterization, repeat infections and relapse urethral stenosis, which finally lead to the decision of fixing a intraluminal stent even if in an unusual location (penoscrotal). The result, 40 months after implantation, is both subjectively and objectively better, with a good mictional calibre and satisfactory erection which allows the patient to have sexual intercourse. The Wallstent prothesis can be the ultimate alternative in those cases of "ill-treated" urethra where other techniques fail.

Endometrial Carcinoma is an uncommon intraductal prostatic tumour, the origin (either from prostatic epithelium or Müellerian) and management (traditional hormonal therapy vs. progestagens) of which has been the subject of vigorous debate. Currently and with the help of the immunohistochemical techniques its origin has finally been confirmed as being prostatic, thus justifying the use of the traditional hormonal therapy applied in prostate acinous carcinoma. The paper contributes one case of Endometrial Carcinoma confirmed by immunohistochemical techniques, as well as a review of the main landmarks in the study of these tumours.

Aztreonam is a monobactam antibiotic with a very specific spectrum of action for gram-negative aerobic bacteria. Since these bacteria are responsible for most of the urinary tract infections, we conducted a study to determine its efficacy in the prophylaxis and treatment of infections in prostate surgery, one of the most common procedures performed in our field. Thirty-two patients received 1 gm Aztreonam at the time of anesthetic induction and q 8 h thereafter to a total dose of 3 gm. Cultures were performed before and 72 h after surgery. Twenty-eight patients had no complications and a sterile urine culture or less than 10,000 colonies, 2 developed wound infection from Staph, aureus and 1 had more than 100,000 colonies of Enterococci in urine. The foregoing findings indicate that Aztreonam is useful for prophylaxis and treatment of urinary tract infections in prostate surgery.

Renal oncocytoma is an uncommon, generally benign tumor of the renal parenchyma arising from tubular cells with typical gross, microscopic and ultrastructural features. We report another case of renal oncocytoma that had been treated conservatively on the basis of the pre- and intraoperative findings. The present case provides further insight into the biological behaviour of this tumor type. Its origin, pathological features, diagnostic and therapeutic difficulties, and prognosis are discussed.