non-invasive bladder urothelial carcinoma
Stage 0 includes: 0a (Ta, N0, M0); 0is (Tis, N0, M0). Ta: Noninvasive papillary carcinoma. Tis: Carcinoma in situ: "flat tumor". N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 6th and 7th eds.)