title: Hyperplastic polyp of the common bile duct.
abstract: We describe a hyperplastic polyp of the common bile duct, found in a 45-yr-old Japanese woman. Endoscopic retrograde sphincterotomy and intraductal biopsy yielded a histological diagnosis of adenocarcinoma, preoperatively. However, final diagnosis after pancreatoduodenectomy proved to be hyperplasia. The wrong diagnosis seemed attributable to tortuosity of the specimens caused by the biopsy procedure and/or a lack of experience of pathologists due to the rarity of this condition. One should be aware of this entity in diagnosing polypoid lesions in the biliary tract.
authors.affiliation: Department of Surgery, Kyushu University Faculty of Medicine, Fukuoka, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yokohata
authors.forename: K
authors.initials: K
authors.lastname: Yamaguchi
authors.forename: H
authors.initials: H
authors.lastname: Kimura
authors.forename: M
authors.initials: M
authors.lastname: Tanaka
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology; D003138:Common Bile Duct Neoplasms / Q000473:pathology*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D006965:Hyperplasia; D008875:Middle Aged; D011127:Polyps / Q000473:pathology*