title: Endoscopic ultrasound-guided pancreatic pseudocyst cystogastrostomy using a novel self-expandable metal stent with antimigration system: A case series.
abstract: OBJECTIVE
  Development of symptomatic pseudocysts after acute pancreatitis is a common occurrence. Endoscopic ultrasound (EUS)-guided transmural drainage has become the treatment of choice for symptomatic pseudocysts. Following this procedure, stent migration can occur. A recently developed fully covered biliary metal stent with antimigration system has shown promise as an alternative endoprosthetic option for cystogastrostomy. The aim of this study is to describe the success and complications of using covered metal stents with antimigration system to drain pseudocysts at a single tertiary care center.
  
  
  METHODS
  The patients undergoing cystogastrostomy using the biliary metal stent with antimigration system over the course of a 10-month period (January-November, 2014) were retrospectively reviewed and all the pertinent information including length of the follow-up, age and sex of the patient, pseudocyst size, pseudocyst size at follow-up, and symptom improvement were recorded.
  
  
  RESULTS
  Five patients underwent endoscopic cystogastrostomy using a biliary metal stent with antimigration system. The average age of the patients was 57 years, with all the patients being males. The average size of the largest dimension of pseudocyst was 9 cm. The average follow-up time to repeat imaging was 30 days. All the patients had a significant improvement in their pseudocyst size, with two patients having complete resolution, one patient with a residual 2 cm cyst, and another with a residual 5 cm pseudocyst at follow-up. The average size at follow-up was 2 cm. No complications occurred during the follow-up period. No episodes of stent migration occurred. All the patients had symptom improvement at follow-up.
  
  
  CONCLUSIONS
  Using a novel biliary covered self-expandable metal stent with antimigration system with EUS guidance to drain pseudocysts appears to be a safe and effective procedure in certain settings. Our experience shows rapid cyst resolution with no complications and no stent migration. This stent gives the providers another option when performing cystogastrostomy.
authors.forename: Eric M
authors.initials: EM
authors.lastname: Nelsen
authors.forename: Eric A
authors.initials: EA
authors.lastname: Johnson
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Walker
authors.forename: Patrick
authors.initials: P
authors.lastname: Pfau
authors.affiliation: Division of Gastroenterology and Hepatology, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA.
authors.forename: Deepak V
authors.initials: DV
authors.lastname: Gopal