[Clinical pathological studies on colo-rectal cancer with a diameter of 1.5 cm or less]

This study was undertaken to investigate the average rate of carcinomatous occupation in 99 colorectal cancers with a diameter of 1.5 cm or less of each macroscopic form ("pedunculated", "tumor", plaque-like" and "central depression" type). The results were follows; The ratio carcinomatous occupation was low in "pedunculated" type in which "m" cancer was high in frequency . This ratio was high in "tumor" type a diameter of 1.0 cm or more in which "sm" cancer was high in frequency, showing that "tumor" type tend to invade from mucosal to submucosal layer. This ratio were high in "plaque-like" and "central depression" type in which "sm" and "pm" cancer were high in frequency, indicating that "plaque-like" and "central depression" type had little relation to adenoma.