Transmastoid decompression of the facial nerve in Bell's palsy.

We describe the technique of decompression of the facial nerve from the geniculate ganglion to the stylomastoid foramen. The decompression was made on 51 patients with Bell's palsy, and the results of follow-up study were compared with those of 77 patients in whom the pyramidal and vertical segments were decompressed. The decompressions were indicated when a severe denervation of the nerve was confirmed by electrodiagnostic examinations. Incidences of notable residual palsy and of pronounced sequelae were always lower in the former group of patients regardless of the operational timing. In either group, a more desirable result was obtained by the decompression within 30 days, but a favorable effect of the decompression was recognizable even when the surgery was performed between 31 and 90 days after the onset.