Acute multiple sclerosis in a 13-year-old female adolescent.
A, T2-weighted image shows multiple hyperintense lesions in the periventricular subcortical white matter and corpus callosum (arrows).
B and C, DW image shows some lesions as hyperintense with decreased ADC. They represent cytotoxic plaques presumably related to excitotoxic injury of oligodendrocytes, myelin sheaths, and axons.