Bilateral cerebellar peduncle lesions in JC virus encephalitis

摘要

A 33-year-old man presented with a vague history of progressive gait unsteadiness and oscillopsia of 3-month duration. His medical history was unremarkable. Physical examination on admission revealed gait and trunk ataxia, gaze evoked nystagmus, severe dysarthria, and mildly impaired finger-to-nose performance. The patient was afebrile and routine blood tests were normal. A head computed tomography scan did not show any lesions. Magnetic resonance imaging revealed marked cerebellar peduncle lesions along with smaller lesions in the cerebellar vermis and within the pons (Figure 1).