label: non-invasive bladder papillary urothelial neoplasm
label_lc: non-invasive bladder papillary urothelial neoplasm
description: "A papillary neoplasm of the urinary bladder in which the transitional cells form papillae. The papillary structures exhibit minimal architectural distortion and minimal atypia. Mitoses are infrequent. Patients are at an increased risk of developing new papillary lesions. Occasionally, the new lesions are urothelial carcinomas."