X-MAS Biliary Study With Covered Biliary Stent

Inclusion Criteria: 1. Age 18 or older. 2. Clinical symptoms of biliary obstruction. 3. Presence of inoperable extrahepatic distal biliary obstruction by any malignant process (the subject not being a surgical candidate based on the finding of a pancreatic mass \>2.0cm or a severe medical illness). 4. Subject is willing and able to comply with the study procedures and provide written informed consent to participate in the study. 5. Insured by Social Security (applicable to subjects screened in France). Exclusion Criteria: * 1\. Participation in an Investigational Study within 90 days prior to date of subject consent. 2\. Perforation of any duct within the biliary tree. 3. Presence of more than one previously implanted plastic stent. 4. Previous plastic stent implantation less than 2 weeks prior to current procedure. 5\. Presence of a metal biliary stent. 6. Presence of any esophageal or duodenal stent. 7. Previous Bilroth II or Roux-en-Y gastric resection, a significant duodenal obstruction or any other altered anatomy which could prevent access to ampulla. 8\. Subjects for whom endoscopic procedures are contraindicated. 9. Subjects with known sensitivity to any components of the stent or delivery system. 10\. Subjects with active hepatitis or other hepatic diseases that may cause jaundice. 11\. Subjects with a WHO performance score of 4 - Bedbound (completely disabled, cannot carry on any self-care, totally confined to bed or chair). 12\. Subjects known to be pregnant. Cholangiographic exclusion criterion: 13\. Strictures that cannot be passed by the guide wire or the delivery system.