title: [Collision tumor of a carcinoid and carcinoma in the rectum].
abstract: A man in his seventies visited our hospital due to positive a fecal occult blood test. Colonoscopy showed a submucosal tumor in the rectum covered with reddish and irregular mucosa. Pathological examination of the biopsy specimen revealed well differentiated adenocarcinoma. The tumor was resected, and pathological examination showed carcinoid and adenocarcinoma components coexisting and mixed with each other. Because a previous colonoscopy had shown a submucosal tumor with a smooth surface, this case was diagnosed as a collision tumor of adenocarcinoma which developed on a carcinoid.
authors.affiliation: Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine. motohiko@gh.med.osaka-u.ac.jp
authors.forename: Motohiko
authors.initials: M
authors.lastname: Kato
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Nishida
authors.forename: Shusaku
authors.initials: S
authors.lastname: Tsutsui
authors.forename: Katsumi
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Eiichi
authors.initials: E
authors.lastname: Morii
authors.forename: Takuya
authors.initials: T
authors.lastname: Yamada
authors.forename: Shuji
authors.initials: S
authors.lastname: Ogiyama
authors.forename: Hideki
authors.initials: H
authors.lastname: Iijima
authors.forename: Ichiro
authors.initials: I
authors.lastname: Takemasa
authors.forename: Naoki
authors.initials: N
authors.lastname: Hiramatsu
authors.forename: Masahiko
authors.initials: M
authors.lastname: Tsujii
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Takehara
authors.forename: Mitsugu
authors.initials: M
authors.lastname: Sekimoto
authors.forename: Norio
authors.initials: N
authors.lastname: Hayashi
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology*; D000368:Aged; D002276:Carcinoid Tumor / Q000473:pathology*; D006801:Humans; D008297:Male; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D012004:Rectal Neoplasms / Q000473:pathology*