A 75-year-old Hispanic man presented with a 3-year history of frequent falls conditioned by gait instability and generalized weakness. His symptoms progressed with worsening of gait imbalance, dysarthria, and dysphagia to both solids and liquids. He was previously active and independent, with no relevant past medical history. Upon admission, he exhibited preserved higher mental functions. There were no limitations in eye movements, although saccadic intrusions and multidirectional nystagmus were present.
