Acute renal failure after high-dose methotrexate therapy in a patient with ileostomy.

High-dose methotrexate (HD-MTX) is an important treatment for Burkitt lymphoma, but can cause hepatic and renal toxicity when its clearance is delayed. We report a case of acute renal failure after HD-MTX therapy in a patient with ileostomy, The patient was a 3-year-old boy who had received a living-related liver transplantation for congenital biliary atresia. At day 833 after the transplantation, he was diagnosed with PTLD (post-transplantation lymphoproliferative disorder, Burkitt-type malignant lymphoma).