![]() ![]() Some authors observed that the obstruction of the endolymph flow through ED causes slow, but progressive hearing deterioration and symptoms similar to Meniere’s disease. One of them is a damage of the endolymphatic duct (ED) or sac (ES) during removal of the posterior wall of the internal acoustic meatus (IAM). There exist a few explanations of this phenomenon. The frequency of this fact has a wide range from 0 to 56 %. A deterioration of hearing was observed by many authors. However, a hearing functionality in the short term after the surgery may worsen in the postoperative observation. An immediate hearing loss during a surgery is explained as a result of: (1) a cochlear nerve damage during tumour separation from a nerve (2) a vestibule or cochlea injury during drilling (3) disrupted vascular supply to the inner ear. This aim is fulfilled even in 51 % and depends on multiple factors. It is achievable through a suboccipital retrosigmoid approach, when the preoperative hearing was determined as usable. Hearing preservation is one of the goals during the surgery of vestibular schwannoma (VS). ![]()
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