title: A case of adenomyomatous hyperplasia of the extrahepatic bile duct.
abstract: Adenomyomatous hyperplasia is rarely found in the extrahepatic bile duct. A 54-year-old man was referred to our center with a diagnosis of extrahepatic bile duct stenosis which had been detected by endoscopic retrograde choloangiopancreatography. Abdominal computed tomography revealed thickening of the wall of the middle extrahepatic bile duct, however no malignant cells were detected by cytology. Since bile duct carcinoma could not be ruled out, we performed resection of the extrahepatic duct accompanied by lymph node dissection. Histopathologically, the lesion was diagnosed as adenomyomatous hyperplasia of the extrahepatic bile duct. Present and previously reported cases showed the difficulty of making a diagnosis of adenomyomatous hyperplasia of the extrahepatic bile duct preoperatively or intraoperatively. Therefore, when adenomyomatous hyperplasia is suspected, a radical surgical procedure according to malignant disease may be necessary for definitive diagnosis.
authors.affiliation: Department of Hepatobiliary and Pancreatic Surgery, Kanagawa Cancer Center, Yokohama, Japan.
authors.forename: Masakatsu
authors.initials: M
authors.lastname: Numata
authors.forename: Soichiro
authors.initials: S
authors.lastname: Morinaga
authors.forename: Takuo
authors.initials: T
authors.lastname: Watanabe
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tamagawa
authors.forename: Naoto
authors.initials: N
authors.lastname: Yamamoto
authors.forename: Manabu
authors.initials: M
authors.lastname: Shiozawa
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Kameda
authors.forename: Shinichi
authors.initials: S
authors.lastname: Ohkawa
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Rino
authors.forename: Makoto
authors.initials: M
authors.lastname: Akaike
authors.forename: Munetaka
authors.initials: M
authors.lastname: Masuda