Abstract
We report a patient with hyperplastic polyp developing after endoscopic polypectomy for early colonic cancer.
A 62-year-old man was admitted to our hospital due to endoscopic polypectomy for early colonic cancer (type Ip) with big stalk, sized about 15mm in diameter at the sigmoid colon. The removed lesion revealed histologically as papillotubular adenocarcinoma with invasion to the submucosal layer (sm2) . Follow-up endoscopy after 17 days showed a reddish lobular polyp (type Ip) at the resected site. Sigmoidectomy was performed and resected lesion revealed histologically as hyperplastic polyp.
A case of colonic hyperplastic polyp developing after endoscopic polypectomy for early colonic cancer has never been reported in Japan. The mechanism was still unknown, but was thought that excessive regeneration of epithelium was promoted by defect of epithelium after endoscopic polypectomy, suture of resected edge by clips and mechanical stimulation by peristalsis and stool.
