A in situ carcinoma that involves the caecum. The disease is carcinoma in situ of cecum (Monarch Disease Ontology identifier MONDO_0021289). Also known as: caecum carcinoma in situ, caecum in situ carcinoma, carcinoma in situ of caecum, carcinoma in situ of the cecum, cecum carcinoma in situ, cecum carcinoma in situ aJCC v6, cecum carcinoma in situ aJCC v7, stage 0 caecum carcinoma.