title: A potential pitfall with lesions of the renal pelvis.
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*; D011187:Posture; D011859:Radiography