Abstract
Vertical oscillopsia, dysequilibrium, ataxic gait, truncal ataxia and dysarthria were noted in a 20-year-old male with a 4-year history of daily toluene abuse. CT and MRI of the brain revealed no atrophy of the cerebrum, cerebellum, or brainstem. However, T2-weighted MRI demonstrated a high intensity area bilaterally in the pontine corticospinal tracts. Pure tone audiogram and SISI were normal. The I - V interpeak latency of ABR was prolonged bilaterally. Vertical nystagmus was noted during positioning and positional tests. ENG revealed saccadic pursuit, poor OKN and failure of visual suppression of caloric nystagmus.
The patient's neurological symptoms disappeared. Follow-up neurotological examinations demonstrated improved ENG findings. However, subclinical deficits remained in ABR and stabilometric tests.
