Ascending myelopathy developed in a previously irradiated 10-year-old boy after intraventricular methotrexate and cytosine arabinoside were given for central nervous system relapse of acute lymphoblastic leukemia. The course was fatal in 10 weeks. Cerebrospinal fluid myelin basic protein levels, indicating a demyelinative process, rose prior to the onset of clinical symptoms and remained at very high levels until death. Myelin basic protein may be useful as a predictor of chemotherapy-associated neurotoxicity.
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