Beck H J, Beatty C W, Harner S G, Ilstrup D M
Otolaryngol Head Neck Surg. 1986 Jan;94(1):96-103. doi: 10.1177/019459988609400116.
From 1966 through 1983, 408 patients underwent primary removal of an acoustic neuroma at the Mayo Clinic. Of these, 21 had preoperative pure tone hearing levels of 25 dB hearing loss or better at 500, 1000, and 2000 Hz, which for this study was defined as normal pure tone hearing. Fourteen patients (67%) had dysequilibrium and 13 (62%) had subjective hearing impairment. Nystagmus was the most common physical finding. Five patients (23%) had completely symmetric pure tone hearing levels through all frequencies tested. The mean speech discrimination score was 90%. Mean tumor size was 2.4 cm. Brain stem evoked response audiometry was the most helpful of the special tests in the evaluation of these patients with normal pure tone hearing levels. Our results suggest that 5% of patients with acoustic neuromas have normal pure tone hearing levels. A careful history, a thorough physical examination, and an appropriate selection of tests will identify these patients.
1966年至1983年期间，408例患者在梅奥诊所接受了听神经瘤的初次切除手术。其中，21例患者在500、1000和2000赫兹频率下的术前纯音听力损失为25分贝或更低，在本研究中这被定义为正常纯音听力。14例患者（67%）有平衡失调，13例患者（62%）有主观听力障碍。眼球震颤是最常见的体格检查发现。5例患者（23%）在所有测试频率下的纯音听力水平完全对称。平均言语辨别得分是90%。平均肿瘤大小为2.4厘米。脑干听觉诱发电位测试是评估这些纯音听力水平正常患者的特殊检查中最有帮助的一项。我们的结果表明，5%的听神经瘤患者纯音听力水平正常。详细的病史、全面的体格检查以及适当选择检查项目将有助于识别这些患者。
