Abstract
A 62-year-old man complaining of change of stool was admitted to our hospital. Colonoscopy revealed type2' advanced cancer of the descending colon of which ulcer bed was more whitish than usual advanced cancer. Many white and round structures were observed on the surface of the round wall. A biopsied specimen revealed squamous cell carcinoma. He underwent left hemicolectomy, and histological diagnosis of adenosquamous carcinoma (ss, n2+, ly1, v0, P0, H0, stage IIIb) was made. 4 months after surgery, metapaatic carcinoma of th jejunum was found because of melena. It was thought that white and round structures observed in our case were characteristic findings of squamous cell carcinoma. The most possible presumption in our case is that squamous cell carcinoma in adenosquamous carcinoma could be secondary metaplastic modification of adenocarcinoma.
