Collision tumor of a carcinoid and carcinoma in the rectum

Motohiko Kato, Tsutomu Nishida, Shusaku Tsutsui, Katsumi Yamamoto, Eiichi Morii, Takuya Yamada, Shuji Ogiyama, Hideki Iijima, Ichiro Takemasa, Naoki Hiramatsu, Masahiko Tsujii, Tetsuo Takehara, Mitsugu Sekimoto, Norio Hayashi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)61-69
Number of pages9
JournalJournal of Japanese Society of Gastroenterology
Issue number1
Publication statusPublished - 2010 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Gastroenterology


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