Preservation of the auditory nerve function after translabyrinthine removal of vestibular schwannoma
| Autor: | Kensuke Kiyomizu, Shizuo Komune, Tetsuya Tono, Koji Matsuura, Meiho Nakayama, Hirokazu Kawano, Katsuhiro Toyama, Keiji Matsuda |
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| Rok vydání: | 2006 |
| Předmět: |
Adult
Male Fundus (eye) Schwannoma Resection Preoperative Care Evoked Potentials Auditory Brain Stem otorhinolaryngologic diseases Humans Medicine Postoperative Period Nerve function Cochlear Nerve Aged Vestibular system Tumor size business.industry Neuroma Acoustic General Medicine Middle Aged medicine.disease Magnetic Resonance Imaging Electric Stimulation Otorhinolaryngologic Surgical Procedures Functional integrity Auditory brainstem response Otorhinolaryngology Ear Inner Female Surgery Nuclear medicine business |
| Zdroj: | Auris Nasus Larynx. 33:7-11 |
| ISSN: | 0385-8146 |
| DOI: | 10.1016/j.anl.2005.09.007 |
| Popis: | Objective To evaluate the function of the postoperative auditory nerve preserved after translabyrinthine (TL) vestibular schwannoma (VS) removal. Methods Fifteen patients, who underwent unilateral VS resection via a TL approach, were preserved auditory nerve anatomically. The size and location of VS were measured on MRI preoperatively. After surgery, the electrical stimulation test (EST) or electrically evoked auditory brainstem response (EABR) was performed. Results Four cases (27%) out of fifteen patients were retained the functional integrity of the auditory nerve after surgery. The maximum tumor size in the group with a positive response to EST or EABR was significantly smaller than that in the group with a negative response to EST. It seems to be difficult to preserve auditory nerve function in cases where a tumor extends to the fundus of internal auditory canal. Conclusion These results suggest that size of tumor and/or extension of tumor to the fundus might be important factors in preserving the auditory nerve function even if using a TL approach. |
| Databáze: | OpenAIRE |
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