A 3-year-old child diagnosed as having acute lymphatic leukemia (ALL), developed meningeal leukemia 36 months after the onset of the disease. He was twice subjected to cranial irradiation plus intrathecal methotrexate (i.t. MTX). Skull radiology showed bilateral gyriform calcification of both cerebral hemispheres. Hematological relapse was first detected 5 years after diagnosis and the child died 5 months later. The most striking findings of a right frontal lobe biopsy and the postmortem examination were wide calcium deposits located in the cortex and in the adjacent white matter. Intense demyelination as well as areas of neuron poverty were apparent in the necropsy but not in the biopsy specimen. The possible interrelationship between such deposition and cranial irradiation and/or i.t. MTX suggests a new iatrogenic disorder.

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