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¹Istanbul Medical Faculty. Department of Neurosurgery. Türkiye
²Department of Neurosurgery. Frenchay Hospital. Bristol. England The clinical and operative findings are reviewed in 40 patients with hemifacial spasm. Vascular cross-compression of the facial nerve adjacent to the brain stem was noted in 39 patients. In 38 the abnormality was usually by an arterial loop. In one patient. osseus contact was discovered and drilled away. Mortality was zero and. morbidity was minimal. Complete cure of spasm was achieved in 36 cases (90%) and a further 2 patients improved. Keywords : Facial nerve; Hemifacial spasma; Microvascular decompression; Roodexit zone