title: Renal pseudoenlargement due to masses in posterior pararenal space.
abstract: Two patients presenting with acute flank pain had unilateral smooth enlargement of a kidney on excretory urography with associated attenuation of the collecting system. This presentation suggested intrinsic renal disease, but sonography showed the urographic findings to be due in each case to a mass in the posterior pararenal space. By displacing the kidney anteriorly and away from the x-ray film, such masses will result in radiographic enlargement of the renal outline, i.e., renal pseudoenlargement. The distinction between true renal enlargement and pseudoenlargement may be made by sonography.
mesh_terms: D000005:Abdomen; D000293:Adolescent; D003937:Diagnosis, Differential; D006406:Hematoma / Q000150:complications; D006801:Humans; D007674:Kidney Diseases / Q000000981:diagnostic imaging* / Q000209:etiology; D008223:Lymphoma / Q000150:complications; D008297:Male; D008875:Middle Aged; D010181:Pancreatic Cyst / Q000150:complications; D011859:Radiography