Abstract
A 62-year-old man was admitted to our hospital because of bloody stool. Total colonoscopy had been done three times during one year and 4 months. Total thirty-three colonic polyps detected were polypectomized. Out of 33 polyps, 7 were mucosal carcinoma. On the third colonoscopy, a broad based elevated lesion, 1.0 cm in size, in the sigmoid colon which looked like submucosal tumor was also polypectomized. On histological study, it was shown to be well-differentiated adenocarcinoma which showed massive submucosal invasion and cancerous tissue at the cutting margin. Therefore, consecutive surgical resection of the sigmoid colon was performed. However, no local cancerous residue nor lymph node's metastasis were demonstrated. Early colonic cancer showing submucosal tumor is rare.
