[Collision tumor of a carcinoid and carcinoma in the rectum].
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.
Kato
Motohiko
M
Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine. motohiko@gh.med.osaka-u.ac.jp
Nishida
Tsutomu
T
Tsutsui
Shusaku
S
Yamamoto
Katsumi
K
Morii
Eiichi
E
Yamada
Takuya
T
Ogiyama
Shuji
S
Iijima
Hideki
H
Takemasa
Ichiro
I
Hiramatsu
Naoki
N
Tsujii
Masahiko
M
Takehara
Tetsuo
T
Sekimoto
Mitsugu
M
Hayashi
Norio
N
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*