[Tubulointerstitiel nephritis and Crohn's disease, nephrotoxicity or extraintestinal manifestation of Crohn's disease? About a case].

Extraintestinal manifestations in inflammatory bowel disease involve most frequently the joints, the skin, the eyes, the liver and the biliary tract. Renal involvement is rare, and manifested as nephrolithiasis, tubulointerstitial nephritis, glomerulonephritis and amyloidosis. In patients with inflammatory bowel disease, renal disease is most frequently due to treatment nephrotoxicity and rarely as a guenine extraintestinal manifestation of inflammatory bowel disease. We are reporting a case of tubulointerstitial nephritis as an extraintestinal manifestation of Crohn's disease and we are explaining the diagnostic difficulty to distinguish this from drug-induced nephrotoxicity.