Definition

A condition in which abnormal cells are found in the tissue lining the inside of the bladder, renal pelvis, or ureter. Noninvasive papillary carcinoma may look like long, thin, finger-like growths under a microscope and can be low grade or high grade, depending on how abnormal the cells look. These abnormal cells may become cancer and spread into nearby normal tissue. Noninvasive papillary carcinoma is also called stage 0a bladder cancer or stage 0a transitional cell cancer of the renal pelvis and ureter.