🔬 Idiopathic Acute Interstitial Nephritis Associated with Uveitis

A case of acute interstitial nephritis associated with uveitis is presented. An 18-year-old man developed uveitis followed by renal dysfunction. Moderate renal dysfunction (sCr 3.0 mg/dl), and increased levels of urinary β2 microglobulin (over 8, 000μg/l) were observed. Renal tissue obtained by open renal biopsy revealed severe infiltration of mononuclear cells in the tubulo-interstitial area. The majority of infiltrating cells were CD4-positive T cells demonstrated by immunoperoxidase staining, suggesting the involvement of T cell-mediated delayed hypersensitivity. Corticosteroid was effective against both uveitis and renal dysfunction. The possible pathogenesis of this syndrome is reviewed from the literature.