Bilateral cerebellopontine angle arachnoid cysts: Case report

OBJECTIVE AND IMPORTANCE: A rare case of bilateral cerebellopontine angle ( CPA) arachnoid cysts (ACs), accompanied by cerebellar tonsillar displacemen t toward the foramen magnum, is presented. CLINICAL PRESENTATION: A 45-year-old woman presented with progressive dysph agia, vertigo, and truncal ataxia. Magnetic resonance imaging revealed bila teral CPA ACs and cerebellar tonsillar displacement. INTERVENTION: The right CPA AC was excised via a suboccipital approach. Dec ompression of the foramen magnum and duraplasty were also performed. CONCLUSION: The case reported here is the first case of bilateral CPA ACs. Decompression of the foramen magnum and excision of the cyst resulted in co mplete relief of symptoms.