title: X-ray of the month. Renal pelvic filling defect.
mesh_terms: D000368:Aged; D002295:Carcinoma, Transitional Cell / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging*; D007682:Kidney Pelvis / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011859:Radiography