MRI Axial FLAIR Brain shows an infarct in right half of mid brain, a recent infarct with restricted diffusion. Area of involement corresponds to the distribution of one perforating branch of the basilar artery.
These lesions are usually caused by the occlusion of one paramedian basilar branch seen with aging, diabetes and hypertensives. Occasionally associated with intrinsic disease of the basilar or an embolus to the basilar. Clinically present with Weber's syndrome characterized by a classic "crossed" neurology syndrome of an ipsilateral 3rd nerve palsy and a contralateral hemiparesis.