抄録
A 49-year-old man visited our hospital because he was positive for immunological fecal occult blood. Barium enema revealed pedunculated polyps in the sigmoid and transverse colon, so he underwent colonoscopy and two tubular adenomas were resected, which show severe and moderate atypia.
Two months later, on the second colonoscopic examination, a submucosal tumor like elevated lesion with smooth and reddish surface was detected in the descending colon, about 12mm in size. This polyp was resected by snare polypectomy, and pathological findings revealed dilated, congested vessels in the submucosa, which was compatible with arterio-venous malformaion.
In the Japanese literature, only four cases of AVM which show submucosal tumor-like appearance were reported. We should be careful in treating with such polyps to avoid hemorrhage due to polypectomy.
