Dr. Claudio M. de Gusmao: A 69-year-old man was evaluated in the neurology clinic of this hospital because of progressively worsening ataxia. The patient had been well until 9 years before this ...

Since his birth 33 years ago, Jonathan Keleher has been living without a cerebellum, a structure that usually contains about half the brain's neurons. This exceedingly rare condition has left Jonathan ...