Surgical Management of High Jugular Bulb in Acoustic Neurinoma Via Retrosigmoid Approach

摘要: Of 200 patients with acoustic neurinoma undergoing an operation via the retrosigmoid transmeatal approach in semisitting position, 18 had a high jugular bulb on tumor side. The frequency was 9%. From neurosurgical point of view, fossa above low border internal auditory canal (IAC) is classified as one. All were evaluated by computed tomography bone window reconstruction high-resolution thin axial slices (1.5 mm). High bulbs into three grades follows: Grade I, situated less than 1.5 mm IAC; II, between and 3.0 III, > 3 IAC. There eight six four III. In these patients, order to open IAC without concomitant injury bulb, superior posterior portion porus drilled away. Opening unavoidable III cases. No difference noted functional preservation facial or cochlear nerve HJB cases normal cases, but higher air embolism during removal did (16 versus 5%), especially (two four). no mortality morbidity embolism. Details surgical procedure such are discussed.