A 60-year-old woman presented with new numbness of her right arm and face on awakening; no other neurological signs or symptoms were present. Her past medical history was unremarkable aside from smoking (30 pack years). In addition to a small focus of restricted diffusion, brain MRI showed multiple ''cystic" lesions in both hemispheres (Fig. 1). The most likely diagnosis isA. Multiple cystic metastases B. Giant Virchow-Robin spaces C. Subcortical arteriosclerotic encephalopathy D. Neurocysticercosis E. Multiple neuroglial cysts Answer on page 360 Sources of supportThis research did not receive any specific grant from founding agencies in the public, commercial, or not-for-profit sectors. Fig. 1. Cranial CT and MR imaging. (A) Axial cranial CT; (B-C) Axial T2-weighted MRI, (D) coronal FLAIR-MRI with lines indicating transsections and (E) axial diffusion weighted MRI.

No abstract