Pseudotumor of the kidney: a sequel to regional glomerulonephritis.

An unusual case of chronic renal failure associated with an abnormal intravenous urogram simulating renal neoplasm is discussed. Extensive radiographic and histologic studies support the contention that the observed mass lesion resulted from a segmental or regional compensatory hypertrophy. It is likely that this case represents a variant of unilateral glomerulonephritis with sparing of a segment or lobe of one kidney and subsequent hypertrophy of that segment as the remaining renal mass atrophied.