[Renal failure secondary to granulomatous interstitial nephritis as initial manifestation of sarcoidosis].

Sarcoidosis is a rare cause of renal failure and it has been associated with a wide spectrum of renal manifestations, including granulomatous interstitial nephritis. We present the case of a 48-year old male patient with rapidly progressive renal insufficiency due to sarcoid normocalcemic granulomatous interstitial nephritis who lacked the pulmonary signs of sarcoidosis. Prednisone therapy yielded a favorable outcome with fall in serum creatinine level and resolution of abnormalities of the urinary sediment.