breast carcinoma in situ (MONDO_0004658, a Monarch Disease Ontology term) is a in situ carcinoma that involves the breast. Also known as: breast cancer in situ, breast cancer stage 0, breast in situ carcinoma, carcinoma in situ of breast, carcinoma in situ of the breast, in situ breast cancer, non-infiltrating breast carcinoma, non-infiltrating carcinoma of breast.