Methotrexate Induced Acute Encephalopathy-Occurrence on Re-challenge and Response to Aminophylline.

Methotrexate-induced acute encephalopathy is a serious complication of a common chemotherapy agent used in lymphoblastic leukemia. As this drug is considered vital for therapeutic success of leukemia therapy it is often rechallenged in these patients. A patient of acute lymphoblastic leukemia developed mild, transient hemiparesis after the 2nd dose of high dose methotrexate (5 g/m(2)) during the consolidation phase of the BFM-95 protocol. When we repeated the drug in the 3rd cycle he developed severe life threatening quadriparesis and cranial nerve palsies. The toxicity was reversed after treatment with Aminophylline. The relevant literature is reviewed.