SIX CASES OF RECTAL CARCINOID TREATED BY ENDOSCOPIC POLYPECTOMY

-A REPORT OF THE CASES AND THE RIVIEW OF JAPANESE LITERATURES-

Abstract

From 1980 to 1984, we have experienced 6 cases of rectal carcinoid treated by endoscopic polypectomy. The size of tumors were 7-17 mm in diameter and the shape of tumors were sessile or semipedunculated, and microscopical examination revealed that the depth of invasion were to submucosa. No cases with local recurrence or distant metastasis were observed in 2-4 years after endoscopic polypectomy. In the literature, among 496 Japanese cases, there were 7 cases with distant metastasis even in small sized tumor (less than 1 cm in diameter). Statistical analysis of 46 cases with small sized tumor (less than 2 cm in diameter) in the literature were done concerning the relationship between various characters of the tumor and the incidence of distant metastasis. There were no significant relationship among shape of the tumor, depth of invasion, the pattern of silver impregnation, central depression and the incidence of distant metastasis. In conclusion, although our cases showed favourable course, it is necessary to evaluate the histological findings carefully and decide the treatment even in the cases with small sized tumor (less than 1 cm in diameter).