Hybrid neurofibroma-schwannoma of the orbit: a case report and review of the literature.

Hybrid peripheral nerve sheath tumor is a rare tumor subtype that infrequently occurs within the orbit. A 50-year-old male presented with a 6-year history of worsening left-sided proptosis and hypoglobus. Magnetic resonance imaging of the orbits revealed a left superior extraconal, muti-lobulated orbital lesion with extension into the left orbital apex originating from the left frontal nerve. The patient underwent surgical resection of the mass via a left orbito-cranial approach. Histopathologic examination was positive for orbital hybrid neurofibroma-schwannoma. Postoperatively, the patient had improvement in proptosis, resolution of symptoms, and improved cosmesis. This case represents the eleventh reported occurrence of orbital hybrid neurofibroma-schwannoma.