The Eight-and-a-half-syndrome, the combination of a facial nerve palsy + one-and-a-half-syndrome, was first coined by Eggenberger. It is caused by a lesion (often vascular or demyelinating) in the dorsal tegmentum of the caudal pons involving the parapontine-reticular formation or abducens nucleus and the medial longitudinal fasciculus, as well as the nucleus and the fasciculus of the facial nerve. Clinically the following signs are noted:
Partha S Ghosh, MD, Cleveland Clinic
Dr. Ghosh reports no disclosures.
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