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A 48-year-old man developed progressive vertigo, ataxia, and dysarthria.MRI demonstrated gadolinium-enhancing abnormalities in the pons and cerebellar peduncles (figure , A).Further investigations excluded neurosarcoidosis, CNS lymphoma, granulomatosis, and paraneoplastic or Figure Initial T1-weighted postgadolinium brain MRI (A) Symmetric enhancement of the pons and both cerebellar peduncles, with pattern highly suggestive of a perivascular distribution.(B) Near complete resolution with corticosteroids.(C) Recurrence of the same lesions without corticosteroids.
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Lefaucheur et al. (2011) studied this question.
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