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The aim of this study was to measure the incidence of post endovascular aneurysm sealing (EVAS) abdominal aortic aneurysm (AAA) growth, and its association with stent migration, in a cohort of patients with differing compliance to old and new Instructions For Use (IFU). A retrospective single centre study was conducted to review the computed tomography (CT) and clinical data of elective, infrarenal EVAS cases, performed as a primary intervention, between December 2013 and March 2018. All included patients had a baseline post-operative CT scan at one month and at least one year follow up. The primary outcome measure was the incidence of AAA growth and its association with stent migration. AAA growth was defined as a ≥5% increase in aortic volume between the lowermost renal artery and the aortic bifurcation post EVAS at any time during follow up, in comparison to the baseline CT scan. Migration was defined according to the ESVS guidelines, as > 10 mm downward movement of either Nellix stent frame in the proximal zone. Seventy-six patients were eligible for inclusion in the study (mean age 76 ± 7.4 years; 58 men). AAA growth was identified in 50 of 76 patients (66%); adherence to IFU did not affect its incidence (mean growth within IFU-2016 compliant cohort vs. non-compliant: 16% vs. 13%, p =.33). Over time, the incidence of AAA growth increased, from 32% at one year to 100% at four years. AAA growth by volume was progressive (p <.001), as its extent increased over time. Migration was detected in 16 patients and there was a statistically significant association with AAA growth (13 patients displayed migration and AAA growth, p =.036). Patients treated with EVAS are prone to AAA growth, irrespective of whether their aortic anatomy is IFU compliant. AAA growth by volume is associated with stent migration. Clinicians should continue close surveillance post EVAS, regardless of whether patients are treated within IFU. [ABSTRACT FROM AUTHOR]

Trans-cell approach for the Neuroform Atlas stent (Stryker Neurovascular, Fremont, CA) is occasionally unsuccessful as a microcatheter can become stuck in the struts. This study aimed to evaluate the passability and impassability of 0.0165-inch microcatheters through the Neuroform Atlas stent using a simplified benchtop model. The distal struts of the target cell, referred to as the concave or convex crown, were found to interfere with microcatheter advancement during the trans-cell approach. The procedure was performed across each crown using the 1.7-Fr SL-10 and 1.6-Fr Headway Duo microcatheters (MicroVention-Terumo, Aliso Viejo, CA), and it was repeated 20 times. We evaluated the procedural success rate, passability of each microcatheter using the maximum moving distance of the target crown in successful procedures, and device behaviors. The procedural success rate across the concave crown was significantly higher than that across the convex crown in both microcatheters. The maximum moving distance of the concave crown was significantly shorter in the Headway Duo microcatheter than in the SL-10 microcatheter. All procedures across the convex crown were not successful because the sharp end of the crown fell into the interspace inside the microcatheter tip, which is referred to as the crown jackpot phenomenon. The trapped microcatheter was never released from the crown unless it was pulled back proximally. Target crowns and microcatheters affected the use of the trans-cell approach through the Neuroform Atlas stent. The passability was excellent in a lower profile 0.0165-inch microcatheter. Moreover, neurointerventionalists must be knowledgeable of the crown jackpot phenomenon, which might cause fatal stent migration. [ABSTRACT FROM AUTHOR]

Venous stenting is a common treatment for chronic peripheral venous disease. The most frequent complications caused by this technique are stent misplacement and intracardiac or intravascular stent migration. In this publication, we will describe the first case of an intraspinal stent misplacement leading to lumbar nerve root compression. Our patient was a 20-year-old woman with a bilateral pulmonary embolism caused by a right common iliac vein thrombosis and a severe compression of the left common iliac vein by the right common iliac artery (May–Thurner or Cockett syndrome). She underwent an endovascular stenting of the left iliac vein. A few days later, she reported some pain in the right L5 radicular and showed signs of hypoesthesia of the left leg and of paresis of the left extensor hallucis longus muscle. A lumbar computed tomography scan showed a stent misplacement into the spinal canal through the left L5 foramen with nerve root compression. She underwent a surgical removal of the stent through a unilateral L5–S1 laminarthrectomy. The postoperative follow-up showed a complete clinical recovery and a control lumbar computed tomography scan confirmed the L5 nerve root decompression. The intraspinal misplacement of a venous stent is a rare complication that may cause nerve root injury. It requires a prompt treatment. Surgically removing the stent by a posterior approach seems to be a simple and safe therapeutic option. [ABSTRACT FROM AUTHOR]

Abstract Objective Endovascular aneurysm repair (EVAR) has become the standard of care for infrarenal aneurysms. Endografts are commercially available in proximal diameters up to 36 mm, allowing proximal seal in necks up to 32 mm. We sought to further investigate clinical outcomes after standard EVAR in patients requiring large main body devices. Methods We performed a retrospective review of a prospectively maintained database for all patients undergoing elective EVAR for infrarenal abdominal aortic aneurysms at a single institution from 2000 to 2016. Only endografts with the option of a 34- to 36-mm proximal diameter were included. Requisite patient demographics, anatomic and device-related variables, and relevant clinical outcomes and imaging were reviewed. The primary outcome in this study was proximal fixation failure, which was a composite of type IA endoleak and stent graft migration >10 mm after EVAR. Outcomes were stratified by device diameter for the large-diameter device cohort (34-36 mm) and the normal-diameter device cohort (<34 mm). Results There were 500 patients treated with EVAR who met the inclusion criteria. A total of 108 (21.6%) patients received large-diameter devices. There was no difference between the large-diameter cohort and the normal-diameter cohort in terms of 30-day (0.9% vs 0.95%; P =.960) or 1-year mortality (9.0% vs 6.2%; P =.920). Proximal fixation failure occurred in 24 of 392 (6.1%) patients in the normal-diameter cohort and 26 of 108 (24%) patients in the large-diameter cohort (P <.001). There were 13 (3.3%) type IA endoleaks in the normal-diameter cohort and 16 (14.8%) in the large-diameter cohort (P <.001). Stent graft migration (>10 mm) occurred in 15 (3.8%) in the normal-diameter cohort and 16 (14.8%) in the large-diameter cohort (P <.001). After multivariate analysis, only the use of Talent (Medtronic, Minneapolis, Minn) endografts (odds ratio [OR], 4.50; 95% confidence interval [CI], 1.18-17.21) and neck diameter ≥29 mm (OR, 2.50; 95% CI, 1.12-5.08) remained significant independent risk factors for development of proximal fixation failure (OR, 3.99; 95% CI, 1.75-9.11). Conclusions Standard EVAR in patients with large infrarenal necks ≥29 mm requiring a 34- to 36-mm-diameter endograft is independently associated with an increased rate of proximal fixation failure. This group of patients should be considered for more proximal seal strategies with fenestrated or branched devices vs open repair. Also, this group likely needs more stringent radiographic follow-up. [ABSTRACT FROM AUTHOR]

This article reports on a retrospective observational study designed to evaluate the incidence, etiology, and clinical implications of aortic neck dilation following thoracic endovascular aortic repair (TEVAR) for aneurysms with landing zones II and III. The study included 37 patients who underwent TEVAR and had postoperative computed tomography angiography available within 30 days and at least one computed tomography angiography at 1 year postoperatively. The primary end point was proximal aortic dilation (defined as growth ≥5 mm or ≥10% of the original diameter), and secondary end points included annual growth of the aneurysmal sac, device migration, endoleak, and reintervention with additional neck-related adverse events. The measurements taken during follow-up included the maximum diameter of the aneurysm and aortic diameter at various locations relative to the stent graft. During follow-up, a significant increase in aortic diameter was observed at the proximal edge of TEVAR. The estimated freedom from 5 mm or 10% proximal aortic neck growth at 1, 2, and 3 years was 81%, 70%, and 65%, respectively. At the proximal edge of TEVAR the type III aortic arch was significantly associated with 5 mm growth during follow-up (P =.047) and this growth (5 mm or 10%) as well as a 10% increase at +20 mm were significantly associated with more aortic-related reinterventions. Moreover, an aortic diameter at the start <36 mm was associated with a greater increase during follow-up (area under curve in receiver operating characteristic >80%; P <.05). The study concludes that proximal aortic dilation after TEVAR is a common and progressive phenomenon, and the management strategies for aortic neck dilation, including surveillance, secondary interventions, and open conversion, should be considered carefully to optimize patient outcomes and improve the long-term success of the procedure. [ABSTRACT FROM AUTHOR]

Backgrounds: Stent migration following endoscopic ultrasonography-guided hepaticogastrostomy (EUS-HGS) may sometimes be fatal because there are no adhesions between the biliary tract and stomach. To prevent stent migration and minimize the stent length in the abdominal cavity, we recently performed EUS-HGS using the technique of releasing the stent within the scope channel.Aims: To examine the technical feasibility of the intra-scope channel stent release technique.Methods: Forty-one consecutive patients who underwent EUS-HGS were enrolled. Between October 2015 and December 2015, EUS-HGS was performed using the extra-scope channel release technique, while the intra-scope channel release technique was performed between January 2016 and March 2016.Results: The distance between the hepatic parenchyma and the stomach wall after EUS-HGS in the intra-scope channel stent release group was significantly shorter than that in the extra-scope channel release group (0.66 ± 1.25 vs 2.52 ± 0.97, P < 0.05). Adverse events, such as biloma or stent migration, were seen in only the extra-scope channel release group.Conclusion: In conclusion, although additional cases and randomized controlled studies using metal stents of various lengths are needed, our technique is likely to be clinically useful for the prevention of early and late stent migration. [ABSTRACT FROM AUTHOR]

Highlights • Pipeline shortening and migration can be disabling and potentially lead to fatality. • Every case of Pipeline migration must have a customized management plan. • A high expertise is required when deploying pipeline in off-label locations. Abstract Since its emergence in 2011, the pipeline flow diversion (PFD) has gained recognition in the treatment of certain intracranial aneurysms. However, early or delayed pipeline migration (PM) and micro-catheter/guidewire retention have been infrequently reported. We report a case of PM and shortening in the treatment of a left cervical internal carotid artery (LICA) aneurysm. A middle-aged African-American patient presents for an off-label PFD treatment of an incidental 21 × 23 mm aneurysm at the sub-petrous segment of the left ICA. While the patient remained completely neuro-intact, a 6 months follow-up angiogram revealed a persisting filling of the cervical aneurysm with a foreshortening of the pipeline by 1/3 of its original 30 mm size and proximal migration into the aneurysmal sac. We opted to watch the aneurysm within 6 months especially that the aneurysm was extra-cranial and because of the potential risks involved in trying to re-access the device. [ABSTRACT FROM AUTHOR]

• Stent migration is an uncommon complication of carotid artery stenting (CAS). • Shortening and migration of closed-cell stents has been reported after CAS. • Migration of open-cell stents is extremely rare after CAS. • We performed CAS for restenosis after endarterectomy for radiation-induced stenosis. • Proximal migration of a tapered-design open-cell stent was revealed after CAS. Stent migration is an uncommon but serious complication of carotid artery stenting. Shortening and migration of closed-cell stents after carotid artery stenting has been reported, but migration of open-cell stents is extremely rare. Herein, we report a case of proximal migration of a tapered-design open-cell stent after carotid artery stenting for restenosis following endarterectomy for radiation-induced stenosis. A 70-year-old man with a history of radiation therapy for tongue cancer approximately 10 years earlier was diagnosed with transient ischemic attack owing to severe stenosis of the right cervical internal carotid artery and was referred to our hospital. We performed carotid endarterectomy with a patch graft; 6 months later, restenosis was observed. Therefore, we performed carotid artery stenting with a self-expandable tapered-design open-cell stent. On the second day after the procedure, asymptomatic downward migration of the stent was detected. During the 3-year follow-up period after stent placement, no restenosis or further stent migration was observed. This report provides evidence that migration of implanted carotid stents can occur even with an open-cell stents. In particular, to our knowledge, there are no reports describing migration of tapered-design open-cell stents in the early postoperative period. [ABSTRACT FROM AUTHOR]

Highlights • Revisional surgery in bariatric patients can sometimes lead to life-threatening complications. • A good combination between endoscopic procedure and surgery is needed to treat a gastric perforation. • Self-expandable stents have a high migration rate, and a laparoscopic extraction is feasible. Abstract Revisional surgery in bariatric patients can sometimes lead to life-threatening complications that need a fast diagnosis and treatment as well as a multidisciplinary approach. If left undiagnosed or untreated, this may lead to sepsis, multiple organ failure, and death. In this case report, we describe the management of a gastric perforation which occurred after conversion of a gastric banding to a sleeve gastrectomy. [ABSTRACT FROM AUTHOR]

Introduction Biliary stent migration (proximal or distal) occurs in 6% of all cases. The majority of these migrating stents are passing through the intestine, without causing any complications. Usually when a stent migration occurs, endoscopic retrieval is the proper treatment option, except in case of complications when surgical removal is the only treatment option. This report presents a case of a biliary stent which migrated and caused a sigmoid colon perforation. Presentation of case A 75 years old female patient presented to the emergency department with diffuse abdominal pain, nausea and vomiting. Clinical examination showed distended abdomen and signs of peritoneal irritation. CT scan of the abdomen revealed free gas and fluid in the left iliac fossa, as well as a foreign body penetrating the sigmoid colon. Emergency laparotomy was performed. A plastic stent was found perforating the sigmoid colon through a diverticulum. The rest of the sigmoid colon was intact presenting only uncomplicated diverticula. Hartmann’s operation was performed, involving the diseased segment, together with part of the descending colon due to profound diverticulosis. Patient’s post-surgical course was uneventful and was discharged on postoperative day 10. Discussion Migration of a biliary stent can cause life-threatening complications such as perforation of the intestine and peritonitis. The migration of the stent from the biliary tree may be mostly asymptomatic except in cases of intestinal perforation that immediate surgery is the proper treatment option. On the other hand, even in cases of benign lesions of the bile duct, the stent should be removed immediately after dislocation in order to reduce the risk of secondary complications such as obstruction, infection or perforation. Conclusion In cases of non-complicated stent migration endoscopic retrieval is the indicated treatment. In patients who suffer serious complications due to stent dislocation, emergency surgery may be the proper treatment option. [ABSTRACT FROM AUTHOR]

Abstract: We assessed the frequency and severity of changes in stent configuration and location after the treatment of intracranial aneurysms, and patterns of in-stent stenosis. We retrospectively reviewed data for consecutive aneurysm patients managed with endovascular implantation of flow-diverter stents (Silk Flow Diverter [Balt Extrusion, Montmorency, France] and Pipeline Embolization Device [ev3/Coviden, Minneapolis, MN, USA]) from October 2011 to July 2012. Routine 2, 6, 9–12, and 16–20month follow-up angiograms were compared, with a focus on changes in stent configuration and location from immediately after deployment to angiographic follow-up, and the incidence and development of in-stent stenosis. Thirty-four patients with 42 aneurysms met inclusion criteria. The Silk device was implanted in 16 patients (47%, single device in 15), the Pipeline device in 18 (53%, single device in 16). On first follow-up angiography, in-stent stenosis was observed in 38% of Silk devices and 39% of Pipeline devices. In-stent stenosis was asymptomatic in 12 of 13 patients. One woman presented with transient ischemic attacks and required stent angioplasty due to end tapering and mild, diffuse in-stent stenosis. Configuration and location changes, including stent creeping and end tapering were seen in 2/16 patients (13%) with Silk devices, and 0/18 patients with Pipeline devices. We describe stent creeping and end tapering as unusual findings with the potential for delayed clinical complications. In-stent stenosis, with a unique behavior, is a frequent angiographic finding observed after flow-diverter stent implant. The stenosis is usually asymptomatic; however, close clinical and angiographic monitoring is mandatory for individualized management. [Copyright &y& Elsevier]

Abstract: Background: Removal of biliary Fully Covered Self Expandable Metal Stents can fail due to stent migration and/or hyperplastic ingrowth/overgrowth. Methods: A case series of 5 patients with benign biliary strictures (2 post-cholecystectomy, 2 following liver transplantation and 1 related to chronic pancreatitis) is reported. The biliary stricture was treated by temporary insertion of Fully Covered Self Expandable Metal Stents. Stent removal failed due to proximal stent migration and/or overgrowth. Metal stent removal was attempted a few weeks after the insertion of another Fully Covered Metal Stent into the first one. Results: The inner Fully Covered Self Expandable Metal Stent compressed the hyperplastic tissue, leading to the extraction of both the stents in all cases. Two complications were reported as a result of the attempt to stents removal (mild pancreatitis and self-limited haemobilia). Conclusion: In the present series, the “SEMS in SEMS” technique revealed to be effective when difficulties are encountered during Fully Covered Self Expandable Metal Stents removal. [Copyright &y& Elsevier]

We present a rare case of TIPS stent migration. TIPS is considered a relatively safe procedure with a high success rate. We present a case of 58 year old male with decompensated alcoholic liver cirrhosis requiring TIPS stent, which fractured and migrated into the pulmonary artery. Our case represents a rare complication, reported only 4% of the population. a rare complication of Transjugular Intrahepatic Portosystemic Shunt. [ABSTRACT FROM AUTHOR]

Summary: A 78-year-old man who had been treated with maintenance hemodialysis for chronic renal failure was admitted with severe edema in left arm for 1 month. Venous angiography showed a severe stenosis in left innominate vein, then, he underwent percutaneous balloon angioplasty and venous stenting (Wall Stent RP). His arm edema soon improved after angioplasty, however, he complained of general fatigue and bradycardia 2 days after the venous angioplasty. Electrocardiogram showed complete atrioventricular block with 35 wide QRS complexes per minute. His echocardiogram showed a pipe-shaped structure with multiple slit and acoustic shadow in right ventricle. His radiographical right ventriculogram revealed the migrated venous stent from innominate vein to right ventricle. We tried to perform percutaneous transvenous stent extraction using Goose-Neck snare catheter, however, the wall stent stuck in the right external iliac vein, and contrast media leaked to the outside of the vascular wall. Therefore, we implanted this stent in the iliac vein with optimal-sized balloon inflation, and succeeded in stopping bleeding. Complete atrioventricular block was recovered to sinus rhythm with left bundle branch block just after the removal of the venous stent from right ventricle, and no cardiovascular events occurred after the treatment. [Copyright &y& Elsevier]

Self-expanding metal stents (SEMS) are routinely used to palliate malignant dysphagia. However esophageal SEMS can migrate or obstruct due to epithelial hyperplasia. The aim of this study was to evaluate the rates and factors predicting migration and obstruction, and the nutritional outcomes in partially covered (pc) vs. fully covered (fc) SEMS vs. fcSEMS with antimigration fins (AF) placed for malignant dysphagia. A retrospective review of consecutive patients undergoing SEMS placement for malignant dysphagia at three academic medical centers. Among 357 patients, there were 55 (15.4%) stent migrations, 45 (12.6%) obstructions from epithelial hyperplasia, and 20 (5.6%) food impactions. Median overall survival was 79 days (IQR 41,199). The percent weight change/change in albumin at 30 and 60 days after SEMS placement were -2.24%/-0.544 g/dL and -2.98%/-0.55 g/dL, respectively. Stent migration occurred significantly more often with fcSEMS than pcSEMS (25.3% vs 10.9%; P <.003), but there was no difference when either group was compared to fcSEMS-AF (19.3%). The overall rate of epithelial hyperplasia resulting in stent obstruction was low (12.6%) and not different between stent types. Factors associated with increased risk of SEMS migration on multivariable logistic regression included stricture traversability with a diagnostic endoscope (OR, 2.37; 95% CI, 1.29-4.35) and use of fcSEMS (OR, 2.56; 1.31-5.00) or fcSEMS-AF (OR, 2.30, 1.03-5.14). Traversability of a malignant esophageal stenosis predicts SEMS migration. In these patients with a limited overall survival, pcSEMS are associated with lower rates of stent migration and similar rates of obstruction compared to fcSEMS. [ABSTRACT FROM AUTHOR]

Interventional internal drainage of the biliary tract has become an established procedure for the temporary and definitive treatment of biliary obstruction due to malignant or benign disease. The complication rate is reported to be so low that when feasible, this technique is preferred over a surgical drainage procedure. A 26-year old woman was referred to the hepatopancreaticobiliary surgery service due to severe abdominal pain for 3 days after undergoing endoscopic retrograde cholangiopancreatography (ERCP). She underwent biliary dilatation and stent insertion for obstructive jaundice secondary to biliary stricture from hepatobiliary tuberculosis. The patient underwent exploratory laparotomy, peritoneal lavage, duodenorrhaphy and tube jejunostomy for bilious peritonitis and duodenal perforation from biliary stent migration. The patient died one day post-operation due to septic shock from secondary bacterial peritonitis. ERCP and other interventional endoscopic biliary interventions are increasingly being used for biliary obstruction. Despite the various complications which arise from these diagnostic and therapeutic modalities, complications are relatively uncommon. Duodenal perforation from biliary stent migration is a rare complication after undergoing ERCP and stenting. However, in patients presenting with severe pain and physical signs of acute abdomen after the procedure, it should always be a consideration. Despite the relative safety of interventional techniques for biliary obstruction, complications like pancreatitis, hemorrhage and perforation may occur. Early recognition and high index of suspicion allows for early intervention with good outcomes. Duodenal perforation from stent migration can occur and when intervention is delayed may lead to morbidity and mortality. • ERCP and other endoscopic biliary interventions are increasingly being used for biliary obstruction. • Despite the safety of interventional techniques, complications like pancreatitis, hemorrhage and perforation may occur. • Duodenal perforation from stent migration can occur and when intervention is delayed may lead to morbidity and mortality. • Early recognition and high index of suspicion allows for early intervention with good outcomes. [ABSTRACT FROM AUTHOR]

Introduction: Stent migrations are described after peripheral endovascular treatments. We report a case of an unusual iliac stent movement after a successful angioplasty. Report: An occlusive distal intimal flap after aorto-iliac endoarterectomy was successfully fixed by stenting of the left external iliac artery. One month later, the patient was readmitted due to contralateral limb acute ischemia. Angiography revealed a right iliac artery thrombosis due to upstream stent migration from the left external iliac artery into the right common iliac artery. The patient underwent a combined surgical and endovascular rescue technique. Conclusion: Turbulent and pulsatile flow, associated with wall remodelling may explain this unexpected complication. [Copyright &y& Elsevier]

Background: Venous stents are commonly placed to ensure patency in patients with chronic peripheral venous insufficiency. Although serious complications are uncommon, peripheral venous stent placement can have some potentially life-threatening complications. One of the most feared, and certainly the most dramatic, complication is stent migration.Case Report: We report on a 55-year-old woman with transvenous migration of an infrarenal inferior vena cava stent into the right atrium and through the intra-atrial septum. The patient expired in the emergency department (ED). WHY SHOULD AN EMERGENCY PHYSICIAN BE AWARE OF THIS?: There are several potentially life-threatening post-surgical complications after an endovascular procedure, some of which occur shortly after the patient is discharged from the recovery unit. Frequently, these patients present to the ED for initial evaluation. Although details of the procedure performed and the surgical intervention might not be available immediately, emergency physicians should consider stent migration when a patient presents in extremis shortly after an endovascular procedure. [ABSTRACT FROM AUTHOR]