1989 Volume 31 Issue 2 Pages 479-482_1
A 64-year old man was admitted to Tokyo kyosai Hospital with complaint of anal bleeding. Colonoscopic examination with biopsies showed a small cancer of IIa + IIc type in the sigmoid colon. On April 30, sigmoidectomy was performed. Neither liver metastasis nor lymph node metastasis were observed. On histology the tumor was small early cancer of IIc + IIa type, 8mm in size and an elevated area around the depression was formed by cancerous tissues invading the submucosal layer. Most part of cancerous tissues were present in the submucosal layer. Normal colonic mucosa was adjacent to cancerous tissue and adenoma component was not present neither in the tumor tissue nor in an area between normal colonic mucosa and the cancerous tissue. These findings suggest that this case is a de novo cancer.
