stage 0

Definition of stage 0 colorectal carcinoma in situ
National Cancer Institute

stage 0 colorectal carcinoma in situ

(...KOH-loh-REK-tul KAR-sih-NOH-muh in SY-too)
Abnormal cells are found in the mucosa (innermost layer) of the colon and/or rectal wall. These abnormal cells may become cancer and spread into nearby normal tissue.

Source: NCI Dictionary of Cancer Terms