![]() ![]() Hearing loss Loop Neurovascular conflict Retrosigmoid approach Surgical decompression Tinnitus.Ĭopyright © 2018 Elsevier Inc. Methods: The hemifacial spasm patients were treated of microvascular decompression surgery with neurophysiologic monitoring. This procedure should be considered in patients with disabling tinnitus who have altered ABR and a loop that has a caliber greater than 0.8 mm and is in contact with the cochlear nerve. Objective: To make out the way to distinguish the offending vessels compressed the internal auditory canal part of the facial nerve. Baik F M, Nguyen L, Doherty J K, Harris J P, Mafee M F, Nguyen Q T. Bilateral osteomas arising from the internal auditory canal: case report Neurosurgery 2008 62 02 E528E529., discussion E529 Google Scholar 6. Microsurgical decompression via endoscope-assisted retrosigmoid approach is a promising, safe, and valid procedure for treating tinnitus caused by cochlear nerve compression. Gerganov V M, Samii A, Paterno V, Stan A C, Samii M. After surgery, tinnitus resolved immediately in 2 patients, whereas in the other patient symptoms persisted although they improved in all patients, hearing was preserved and ABR improved. After surgery, none of the patients reported short-term or long-term complications. Patients were treated via an endoscope-assisted retrosigmoid microsurgical decompression. We observed a loop with a caliber greater than 0.8 mm in all patients. Three patients with disabling tinnitus resulting from a loop in the internal auditory canal were evaluated with magnetic resonance imaging and tests of pure tone auditory, tinnitus, and auditory brain response (ABR) to identify the features of the cochlear nerve involvement. Decompression of internal auditory canal (procedure) Code System Preferred Concept Name: Decompression of internal auditory canal (procedure) Concept Status: Published: Concept Status Date: : Code System Name: SNOMED-CT: Concept Relationships Concept Details. This retrospective study examines the clinical characteristics of seven patients with cholesteatoma invading the IAC, analyzes possible routes of the cholesteatoma. This study aimed at investigating the safety and validity of microsurgical decompression via an endoscope-assisted retrosigmoid approach to treat tinnitus in patients with neurovascular compression of the cochlear nerve. Cholesteatoma invasion into the internal auditory canal (IAC) is rare and usually results in irreversible, complete hearing loss and facial paralysis on the affected side. We suggest that the procedure should be offered to patients with hearing progression based on their SDSs and/or associated progressive increases in their wave III and V latencies on ABRs.Īcoustic neuroma Deafness Hearing Middle fossa craniotomy Neurofibromatosis type 2 Vestibular schwannoma.Ĭopyright © 2019 by the Congress of Neurological Surgeons.The use of surgical cochlear nerve decompression is controversial. IAC decompression allows early objective hearing responses in select patients. ABRs improved in 4 patients following decompression. SDSs improved from 85% to 92.5% on average (n = 12) and from 55% to 77.5% in the hearing progression group (n = 4). In the hearing maintenance group, the SDSs remained stable. In patients with prior hearing progression, hearing responses were observed in 3 of the 4 patients during the first year. Treatment was proposed to stop hearing progression based on the speech discrimination scores (SDSs n = 4) or for hearing maintenance (n = 8). All had a progressive change of their ABRs documented from the diagnosis of NF2 over a mean period of 6.25 yr. All had NF2 according to the Manchester criteria. Twelve NF2 patients were operated on from 2011 to 2016 for IAC decompression. Retrospective chart review of middle fossa craniotomy for IAC osteodural decompression in NF2-related vestibular schwannomas. To evaluate the course of auditory brainstem responses (ABRs) and the early hearing response during the first year following IAC decompression for small to medium-sized vestibular schwannomas occurring in neurofibromatosis type 2 (NF2). Hearing response following an osteodural decompression of the internal auditory canal (IAC) is controversial.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |