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Abstract: Microvascular decompression of the facial nerve at the level of posterior fossa was employed in the surgical treatment of 37 patients with hemifacial spasm.
Among all patients observed, 86,48% obtained total relief, 10, 81 % presented parcial relief, and in 2,71% failure could be noticed.
In all patients, a vascular conflict was found against the Vil cranial nerve, cerebellar anterior inferior artery was the most frequent conflict (45,94%), seconded by posterior inferior eerebellar artery (27,02%). The conflict was graduate as close contact (24,32%), compresion (56,75%), and distorsion with grooving of the nerve (18,93%). The surgical complications were deafness (5,4%), and definitive hipoacusia (10,81 %), which can be minimized with the routine use of intraoperative brain evoked potential monitoring. The definitive facial paresis was presented in 2 patients, but the disease was classified as slight, causing no funtional or social problems.
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