A small pedunculated adenomatous polyp of the colon found to contain the focus of invasive carcinoma extending to the serosa: report of a case.

A small pedunculated polyp was detected among other polyps in the transverse colon of a 64-year-old man, the resected specimen of which showed an adenomatous polyp 1 cm in diameter, containing the foci of adenocarcinoma invading the submucosa, muscularis, and serosa. This case report stresses the importance of performing careful pathologic examination of resected specimens obtained from endoscopic polypectomy, even for small pedunculated colon polyps.