Orbital Schwannoma Extending to the Lateral Wall of the Cavernous Sinus Through the Superior Orbital Fissure

—Case Report—

抄録

A 58-year-old man presented with a rare orbitocavernous sinus schwannoma that originated from the orbital opthalmic nerve, and manifested as slowly progressive hypesthesia of the right side of the forehead, proptosis, and ocular pain with rapidly worsening visual acuity. Magnetic resonance imaging revealed a huge orbital tumor extending to the lateral wall of the cavernous sinus through the superior orbital fissure. Microsurgical total resection of the tumor was achieved using an epidural orbitofrontal approach with orbito-fronto-zygomatic craniotomy. The histological diagnosis was schwannoma with Antoni type A formation. The postoperative course was uneventful except for the hypesthesia on the right side of the forehead and transient oculomotor paralysis. Surgery was effective to relieve the symptoms and improve the activities of daily living.