RELATIONSHIP BETWEEN LOCATION AND SHAPE OF COLORECTAL TUMORS

Abstract

The location and shape of colorectal tumors were investigated in order to determine whether any correlations could be made between them, using 1706 adenomas and 98 m cancers. The peduncular rate (i. e. the ratio of pedunculated polyps in all tumors) of adenomas ; (1) increased with size at all locations, (2) was not affected by location in adenomas of 5mm or smaller, (3) was higher in the left colon than the right in adenomas of 6mm or larger, and (4) was higher in the right colon than in the rectum in adenomas of 6mm or larger. The peduncular rate of m cancers increased with size at all locations although it was less obvious than in adenomas. However, it showed no significant difference at all locations.In another way, 1) The peduncular rate of colorectal tumors increased with size, both in adenoma and m cancer. 2) Increase in peduncular rate in adenomas tended to be affected by the location of them ; the lowest rate was in the rectum, the highest rate was in the left colon. 3) In m cancers, the peduncular rate increased with size ; it was not affected by location, even in large tumors. Therefore, it is concluded that the shape of colorectal tumors is affected by the location in adenomas, and not in m cancers.