Minipterional Transsylvian Approach for Resection of a Cavernous Malformation in the Optic Chiasm.

Abstract

Optic chiasm cavernous malformations (CMs) are rare. Patients with these CMs typically present with progressive vision loss and are treated via microsurgical resection. We present a middle-aged man with a CM of the optic chiasm and right optic nerve treated via microsurgical resection. We used a minipterional-transsylvian approach. The CM capsule was incised at the lateral surface of the optic chiasm, and the lesion was entered. The malformation was debulked and resected in a piecemeal fashion. A plane was developed circumferentially around the CM borders to separate it from the surrounding neural tissue until removal was complete. At 6-week follow-up, the patient reported stabilized vision in his right eye, and a transient postoperative deficit in his left eye had fully resolved. Postoperative magnetic resonance imaging showed that gross total resection was achieved. Optic apparatus CMs are approached using technical principles similar to brainstem CM resections.