The purpose of this study is to determine the feasibility, easy removability, safety, and migration rate of flared end fully covered self-expanding metal stent (FCSEMS) and anchoring FCSEMS for benign biliary stricture.

Benign biliary strictures (BBS) are usually managed with plastic stents, whereas placement of uncovered metallic stents has been associated with failure related to mucosal hyperplasia. Fully covered self-expanding metal stent(FCSEMS) placement was reported as a useful method for BBS. However, stent migration was a frequent complication of CSEMS placement. Recently, flared end FCSEMS was developed to decrease stent migration, and anchoring CSEMS was newly developed.

Inclusion Criteria:

• Patient over 18 years old
• Patient with benign bile duct stricture

Exclusion Criteria:

• No written informed consent
• Malignant biliary obstruction
• Patients with uncorrectable severe coagulopathy
• Patients with severe cardiopulmonary disease precluding sedation