[Renal failure disclosing interstitial granulomatous nephropathy of sarcoidosis. 4 cases]

In patients with interstitial granulomatous sarcoid nephritis, renal failure often suggests the diagnosis, being rapidly progressive and isolated, i.e. without proteinuria and with few abnormalities of the urinary sediment. The extra-renal signs are usually discreet or absent, and the finding of a paradoxically high or normal calcaemia concomitant with renal failure should alert the clinician. When granulomatous lesions of the kidney are not too old, corticosteroids are remarkably effective in improving renal function.