Acute Renal Failure in Coexisting IgA Nephropathy and Acute Interstitial Nephritis: Complete Recovery after Hemodialysis and Steroid Therapy

Acute renal failure in Immunoglobulin A nephropathy (IgAN), a rare event, is associated with acute tubular necrosis mainly induced by intratubular erythrocytic cast and crescentic glomerulonephropathy (rapidly progressive glomerulonephritis) and the severity paralleled to the degree of glomerular damage. The changes are regarded as those of secondary atrophic response to the glomerular lesions. In that case, renal progression correlates more closely with the severity of tubulointerstitial lesions than with the degree of glomerular lesions in IgAN. Rarely, acute tubulointerstitial nephritis (TIN) could develop independently in primary glomerulonephritis. In this case, the severity of tubulointerstitial lesion was out of proportion with damage of glomerular lesion. To the best of our knowledge, we report the first case of a patient with independently developed severe acute TIN complicating IgAN in Korea. A 38- year-old man was admitted with recurrent hematuria. Proteinuria (