MIDBRAIN ANGIOMA WITH DISCONJUGATE VERTICAL GAZE PALSY

Loss of depression in one eye with contralateral loss of elevation is rare. It has been attributed to a subnuclear lesion of the oculomotor nerve nuclear complex. We present a patient with these signs who has a n arteriovenous malformation occupying his rostral midbrain. We argue that attributing these findings to a subnuclear lesion of the oculomot or nerve complex does not take into consideration the secondary, verti cal action of the obliques.