Abstract
Two patients who presented with severe renal failure and evidence of generalized proximal tubular dysfunction were found to have severe diffuse acute tubulointerstitial nephritis on renal biopsy. No etiology could be found in either case. Both patients had dramatic improvement in renal function following steroid therapy. In the first reported case of its kind, one patient relapsed when steroids were withdrawn, but improved again with reinstitution of steroid therapy. These cases, as well as others in the literature, show that steroids are effective and may be necessary to improve renal function in some patients with acute idiopathic tubulointerstitial nephritis. Evidence of proximal tubular dysfunction is a clue to the presence of this disorder.
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