Clinicopathological Studies on pm-colorectal Carcinoma

Abstract

During the 13 years from 1972 to 1984, 63 cases of colorectal cancer, infiltrating to the proper muscle layer, were experienced, and were evaluated on the basis of clinicopathological findings.
Pm colorectal carcinoma was classified into three groups (pm₁, pm₂, pm₃) according to the depth of invasion into the proper muscle layer.
Most of the pm colorectal carcinomas were located in the rectum (72%). The incidence of pm colorectal carcinoma according to macroscopic classification showed that the ulcerative type had a higher percentage (68%) than the elevated type (32%). As the carcinoma invaded deeper into the proper muscle layer, the incidence of vascular invasion and lymph node meta-stasis tended to become higher. Lymph node metastasis of the elevated type (10%) was less frequent than that of the ulcerative type (21%), and was confined to the regional lymph node (n₁). Therefore, it is indicated that R₂ operation preserving normal physiological function is reasonable for the elevated type and pm₂ group, while more radical surgery is indicated for the ulcerative type.