Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
3063003 | Journal of Clinical Neuroscience | 2007 | 4 Pages |
Abstract
We report the changes in auditory function in a patient with tumor metastasis to the bilateral internal auditory canals (IAC). The hearing gradually deteriorated at frequencies below 1 kHz and above 4 kHz, with the auditory brainstem response (ABR) eventually becoming absent in both ears. However, distortion product otoacoustic emissions (DPOAE) were present at low frequencies, which suggests that the organ of Corti in its upper turn remained unaffected by tumor invasion. Metastatic tumors in the bilateral IAC have been reported to mimic neurofibromatosis type 2, and radiological differentiation from acoustic schwannoma is difficult. We characterize the hearing deterioration caused by metastasis of malignant tumors in the IAC.
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Authors
Michihiko Sone, Naomi Katayama, Naohiro Otake, Eisuke Sato, Yasushi Fujimoto, Masafumi Ito, Tsutomu Nakashima,