Brain MRI of chronic lymphocytic inflammation with pontine perivascular enhancement responsive to steroids (CLIPPERS)

Initial T1-weighted postgadolinium brain MRI of a 48-year-old man with progressive vertigo, ataxia, and dysarthria.
(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.