PEDIATRIC HEMIFACIAL SPASM - THE EFFICACY OF MICROVASCULAR DECOMPRESSION

Hemifacial spasm (HFS), generally a disease of the elderly, is caused by vascular compression of the seventh nerve. Vascular compression is thought to result from atherosclerotic changes within the vessels of t he posterior fossa, and therefore rarely presents in childhood. Here w e describe our experience with 12 patients with onset of HFS during ch ildhood (age 18 or less) and who had surgical exploration of the cereb ellopontine angle. These patients represent less than 1.2% of the pati ent population with HFS operated upon at this institution during the s tudy period. Nine patients had follow-up data extending over 83 months . All 12 patients were found to have microvascular compression of the seventh nerve at the time of surgery. The most common operative findin g was compression of the seventh nerve by a vein, alone or in combinat ion with a branch of the anterior inferior cerebellar artery. At the t ime of discharge and after a mean follow-up period of 125 months, micr ovascular decompression resulted in complete relief of spasm in 67 % o f the patients.