Male, 36 years old, with right-sided weakness, worsening right leg weakness, history of MS. Numerous predominantly periventricular T2 hyperintense lesions are demonstrated. Some of these involve the corpus callosum or are oriented radially with respect to the ventricles. Most demonstrate significant T1 hypointensity. The brainstem and cerebellum are affected to a very mild degree. Brain parenchymal volume is well-preserved. No evidence of edema or mass effect is seen. No abnormal extra-axial fluid collections are detected. Ventricular size and morphology are within normal limits. A mucous retention cyst is present in the right maxillary sinus.
Multiple brain lesions are evident showing morphology and distribution compatible with demyelinating disease.