Alternating Hemiplegia with Ipsilateral Supranuclear Facial Palsy and Abducens Nerve Palsy Caused by Pontine Infarction.

A 62-year-old right-handed man was diagnosed with a cerebral infarction in the ventromedial region of the left lower pons. He showed left abducens nerve palsy, left-sided supranuclear palsy of the lower part of the face and right hemiparesis. We hypothesized that the mechanism underlying the patient's ipsilateral supranuclear facial palsy involved the corticofacial fibers after they crossed the midline.