Abstract
Recently a case of depressed type early cancer of the sigmoid colon was experienced. A 57-year-old man without any chief complaints visited the hospital for minute examination, because he was pointed out on ulcerative lesion of the sigmoid colon at another hospital Colonoscopy showed a reddish depressed lesion with marginal elevasion in the sigmoid colon. Endoscopy showed that the lesion was a IIa+IIc type early colon cancer. The lesion was not considered a possible candidate for endoscopic polypectomy, and sigmoidectomy was performed. Resected specimen showed a depressed lesion, measuring 9×8mm, with marginal elevation and fold convergence macroscopically, although microscopically cancer cells invaded mucosa without any metastasis. Histological diagnosis was well differentiated adenocarcinoma. The cancer tissues were present partially in the marginal elevation but mostly in the depressed lesion.
