title: Covered self-expanding transhepatic biliary stents: clinical pilot study.
abstract: OBJECTIVE
  We report our preliminary results with a new type of self-expanding covered stent for treatment of malignant biliary obstruction.
  
  
  METHODS
  Wallstents, fully covered with high elasticity polyurethane, with an unconstrained diameter of 10 mm and a total length of 69 mm, were placed transhepatically under fluoroscopic guidance in five patients. The length of the biliary obstruction varied between 30-50 mm. At 1 and 3 months (82-98 days) clinical assessment, serum bilirubin measurement, and ultrasound examination of the biliary tree were performed.
  
  
  RESULTS
  Initial uncomplicated deployment of the stents and internal drainage was possible in all patients. Distal stent migration resulted in early biliary reobstruction in one patient. At 3-month follow-up, partial reobstruction, most probably due to sludge formation, was found in another patient.
  
  
  CONCLUSIONS
  Our initial results indicate that the covered, self-expanding Wallstent endoprosthesis can be reliably and safely deployed transhepatically for malignant biliary obstruction.
authors.affiliation: Department of Radiology, University Hospital, Vienna, Austria.
authors.forename: S A
authors.initials: SA
authors.lastname: Thurnher
authors.forename: J
authors.initials: J
authors.lastname: Lammer
authors.forename: M M
authors.initials: MM
authors.lastname: Thurnher
authors.forename: F
authors.initials: F
authors.lastname: Winkelbauer
authors.forename: O
authors.initials: O
authors.lastname: Graf
authors.forename: R
authors.initials: R
authors.lastname: Wildling
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001650:Bile Duct Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary / Q000628:therapy*; D002758:Cholangiography; D001651:Cholestasis, Extrahepatic / Q000000981:diagnostic imaging / Q000628:therapy*; D002780:Cholestasis, Intrahepatic / Q000000981:diagnostic imaging / Q000628:therapy*; D004548:Elasticity; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011140:Polyurethanes; D011474:Prosthesis Design; D012008:Recurrence; D015607:Stents
chemical_list: D011140:Polyurethanes