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.
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