Microsurgical Resection of a Chiasmatic Cavernoma: 3-Dimensional Operative Video.

According to reports from the literature,1,2 depending on the location where cavernomas appear, range from the very common locations to unusual. Cavernous malformations arising from the optic nerve and chiasm are rare, with only few cases reported to date.3-5  We present a case of a 28-yr-old man who suddenly started with sever visual loss in the right eye and homonymous lateral hemianopia in the left eye. Because of the acute symptomatology, a brain MRI was immediately performed in order to diagnose the etiology. The MRI showed a chiasmatic mass with right extension, heterogeneous on T1 and T2 sequences, without enhancement after gadolinium. The surgery was carried out a week after the diagnosis. A right pterional transsylvian approach was performed and the cavernoma was resected with microsurgical maneuvers, preserving the optic nerve fibers, chiasm, and optic tract.  The patient evolved favorably, improving the visual deficit in the postoperative period as can be observed in the postoperative visual field study 7 mo after the surgery.  The patient signed an informed consent for the procedure and agreed with the use of his images and surgical video for research and academic purposes.  Our surgical case emphasizes the importance of a prompt diagnosis and surgery for chiasmatic cavernomas3 associated to visual loss, providing early decompression of the optic apparatus and improvement of the visual field defects after surgery.