title: Collision tumor of the ampulla of Vater - Coexistence of neuroendocrine carcinoma and adenocarcinoma: report of a case.
abstract: Herein, we present a case of coexisting neuroendocrine carcinoma and conventional adenocarcinoma (collision tumor) in the ampulla of Vater, which has seldom been reported in the literature. A 51-year-old man presented with a month history of jaundice. MRCP disclosed about 1.9×1.8 cm sized heterogeneously enhancing mass in ampulla of Vater, causing obstructions of distal common bile duct. He underwent pylorus-preserving pancreaticoduodenectomy under the diagnosis on ampulla of Vater cancer. Pathologically, sections on the ampulla of Vater showed conventional ductal adenocarcinoma extended and collided with poorly differentiated neuroendocrine carcinoma. In conclusion, we hereby presented a case of coexisting neuroendocrine carcinoma and conventional adenocarcinoma in the ampulla of Vater.
authors.affiliation: Department of Surgery, Chonnam National University College of Medicine, Gwangju, Korea.
authors.forename: Hee Joon
authors.initials: HJ
authors.lastname: Kim
authors.affiliation: Department of Surgery, Chonnam National University College of Medicine, Gwangju, Korea.
authors.forename: Byung Gwan
authors.initials: BG
authors.lastname: Choi
authors.affiliation: Department of Surgery, Chonnam National University College of Medicine, Gwangju, Korea.
authors.forename: Choong Young
authors.initials: CY
authors.lastname: Kim
authors.affiliation: Department of Surgery, Chonnam National University College of Medicine, Gwangju, Korea.
authors.forename: Chol Kyoon
authors.initials: CK
authors.lastname: Cho
authors.affiliation: Department of Radiology, Chonnam National University College of Medicine, Gwangju, Korea.
authors.forename: Jin Woong
authors.initials: JW
authors.lastname: Kim
authors.affiliation: Department of Pathology, Chonnam National University College of Medicine, Gwangju, Korea.
authors.forename: Jae Hyuk
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Surgery, Chonnam National University College of Medicine, Gwangju, Korea.
authors.forename: Young Hoe
authors.initials: YH
authors.lastname: Hur
keywords: Adenocarcinoma; Ampulla of Vater; Collision tumor; Neuroendocrine carcinoma