抄録
A 76-year-old man was referred to Nagasaki University Hospital on May, 1975, complaining of blood in stools during the past one month. Digital examination of the rectum disclosed a polypoid tumor on the anterior wall just above the anorectal junction. Colonof iberscopic examination revealed three sessile polypoid tumors at 12, 7 and 8 o'clock just above the dentate line. The surface of the tumors was smooth, brown colored and bled easily on manipulation. The removal of the polypoid tumors was performed on 10 June, 1975, On resected specimens, the tumors were with a size of 2 × 0.8 × 0.7cm, 0.7 × 0.5 × 0.5cm and 0.7 × 0.7 × 0.5cm, and were histologically revealed to be malignant melanoma with malanin deposit. Proctosigmoidectomy and wide excision of the anal skin were carried out on 30 January, 1976, A few involved lymphnodes were removed, but there was no other sign of spread. Subsequent histological examination proved to be a malignant melanoma arising from the anorectum. He remained well for a brief time, but metastases soon became evident in the right II nd rib, skin and lymphnodes of both groins and axillae. He died on 5 sept., 1976. Malignant melanoma of the anorectum is very rare and has been discussed with a review of the literature.
