Colorectal Cancer pT3 a/b TNM Finding

**Semantic type:** Finding

**Definition:** Colorectal cancer with invasion through the muscularis propria into the submucosa, or into non-peritonealized pericolic or perirectal soft tissues, with tumor extension of 5 mm or less beyond the border of the muscularis propria. (from CAP Colorectal Cancer Protocol-January 2005 Revision)

**Synonyms:** - pT3 a b Colon Cancer - pT3 a b Colorectal Cancer - pT3 a b Colorectal Carcinoma - pT3 a b Rectal Cancer