Pseudotumor of left kidney due to sarcoidosis.

Presence of granulomas in the kidney have been reported in up to 40 percent of patients with sarcoidosis. However, granulomatous infiltration producing renal enlargement with distortion of the normal renal contour, and mimicking renal "pseudotumor" is exceedingly rare and is the subject of this case report. Radiographic, scintigraphic, and histologic findings are presented.