Ipsilateral and contralateral vestibular schwannomas in unilateral long-term deaf ears
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- 作者：Shih-Ming Chu and Yi-Ho Young
- 关键词：Delayed endolymphatic hydrops ; Only hearing ear ; Vestibular ; evoked myogenic potential ; Vestibular schwannoma
- 刊名：European Archives of Oto-Rhino-Laryngology
- 出版年：2007
- 出版时间：June, 2007
- 年：2007
- 卷：264
- 期：6
- 页码：693-696
- 全文大小：262 KB
- 刊物类别：Medicine
- 刊物主题：Medicine & Public Health
Otorhinolaryngology
Neurosurgery
Head and Neck Surgery - 出版者：Springer Berlin / Heidelberg
- ISSN：1434-4726
文摘
In the past decade, we have encountered two patients with unilateral long-term deaf ear having vestibular schwannoma. One was on the deaf ear in a 53 years’ woman and the other was on the contralateral hearing ear in a 62 years’ woman. These two patients had total deafness on the right ear since childhood, associated with absent auditory brainstem response (ABR) and caloric responses, whereas normal ABR and caloric responses were shown on the left ear. Although similar physiological findings were disclosed on the deaf ears, MRI scan demonstrated vestibular schwannoma on the different side, that is, one in deaf ear and the other in hearing ear. For the former, absent ABR and caloric results indicate that the tumor originates from the superior vestibular nerve. In contrast with the latter, normal ABR and caloric responses, but absent vestibular-evoked myogenic potentials on the hearing ear imply that the tumor originates from the inferior vestibular nerve. The ipsilateral tumor on the deaf ear underwent intracranial surgical excision, followed by radiosurgery due to tumor recurrence 10 years later, while the contralateral one on the only hearing ear received radiosurgery only. Both patients were rather well, 3 years after last treatment.