title: The "stipple sign" - urographic harbinger of transitional cell neoplasms.
abstract: The trapping of contrast material within the interstices of a papillary growth produces a stippled appearance when viewed end on. Since the majority of transitional cell neoplasms have a papillary configuration, the stipple sign is highly suggestive of the presence of this lesion.
mesh_terms: D000328:Adult; D002295:Carcinoma, Transitional Cell / Q000000981:diagnostic imaging*; D006801:Humans; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging*; D007682:Kidney Pelvis / Q000000981:diagnostic imaging*; D011859:Radiography; D014516:Ureteral Neoplasms / Q000000981:diagnostic imaging*; D001749:Urinary Bladder Neoplasms / Q000000981:diagnostic imaging*