Partial Bilateral Oculomotor Nucleus Lesion Following Surgery of a Fourth Ventricle Ependymoma

Abstract

Abstract The authors present a patient who underwent surgery for an ependymoma filling the fourth ventricle and the Sylvian aqueduct and thus extending to the posterior third ventricle. The tumor was totally removed and postoperatively a partial bilateral third nerve palsy developed. Only levator palpebrae and rectus superior were involved. Those subnuclei are located most medially close to the Sylvian aqueduct and such a clinical presentation is of anatomical interest.

Key Words:

• Aquaeductus sylvii
• Ependymoma
• fourth ventricle
• oculomotor nerve
• oculomotor nucleus
• pupil