Abstract
For 10 years from 1982 to 1991, 30 cases of colorectal camcer, infiltrating to the proper muscle layer, were examined and evaluated on the basis of clicopathological findings.
Pm colorectal carcinoma was classified into two groups according to the depth of invasion into the circular muscle layer (C type) and longitudinal muscle layer (L type).
Most of the pm colorectal carcinomas were located in the rectum (66.7 %). The incidence of pm colorectal carcinoma, according to macroscopic classification, showed that the elevated type had a higher percentage (66.7 %) than the ulcerative type (33.3 %). As the carcinoma invaded deeper into the proper muscle layer the incidence of vascular invasion and lymph node metastasis tended to increase. Vascular metastasis of L type (92.9 %) was higher than that that of C type (43.8 %). Lymph node metastasis of L type was 35.7 % and C type was 31.3%.
The recurrence of the pm colorectal carcinoma was seen in 4 cases.
Two cases were locale recurrences, one was lung metastasis, one was multiple bone metastasis.
