Bilateral cochlear ossification in a patient with Takayasu arteritis

Takayasu arteritis (TAK) is a rare type of noninfectious, systemic vasculitis of unknown etiology. A 45-year-old female diagnosed with TAK complained of acute onset bilateral deafness. Auditory tests revealed complete deafness in both ears. Magnetic resonance imaging with fluid-attenuation inversion recovery of her temporal bone demonstrated high signal intensity in the whole cochlea and vestibule in both ears. Computed tomography carried out 10 months after the onset of bilateral deafness revealed prominent ossification localized in the area around the modiolus in both cochleae. The patient underwent cochlear implantation in both ears. The cochlear lumens were narrowed and filled with scar tissue, which hindered the insertion of an electrode in both ears. In TAK, cases associated with bilateral severe to profound SNHL where corticosteroid therapy is ineffective in improving hearing, cochlear implantation should be considered within a reasonable period to avoid the difficulty of electrode insertion associated with cochlear ossification