Abstract
We report a female case of pontine lacunar infarction showing hemiataxia and homolateral sensory disturbance. The ataxia consisted of limb ataxia and truncal ataxia on the left side. The sensory disturbance appeared as paresthesia on the left half of the body and hypesthesia on the left half of the face. MRI revealed a small lacunar infarction at an opposite site in the upper pons. The lesion was situated in the border zone between the base and tegmentum, and almost on the midline. It was thought to be an infarction in the territory of the paramedian artery. Contralateral cerebellar signs were thought to have been caused by interruption of the precrossed pontocerebellar fibers or destruction of the reticular tegmental pontine nucleus. Further, destruction of the medial lemniscus and ventral trigeminothalamic tract was thought to have elicited sensory disturbance.
