Seidman D A, Chute P M, Parisier S
Department of Otolaryngology, Manhattan Eye, Ear & Throat Hospital, New York, N.Y.
Laryngoscope. 1994 May;104(5 Pt 1):562-5. doi: 10.1002/lary.5541040510.
Computerized tomography (CT) imaging of the inner ear structures is helpful when evaluating a patient for cochlear implantation. The accuracy of CT scan imaging in determining the presence of cochlear ossification was assessed. A retrospective study of 104 implant patient charts, operative reports, and CT scans was performed. The CT scan was in agreement with the operative findings in 78% of patients included in the study. Twenty-two percent were found to have ossification at surgery which was not detected radiographically. One patient with extensive otospongiosis and an obstructed cochlea on CT scan had a patent cochlea demonstrated by magnetic resonance imaging (MRI) which was corroborated at surgery. In 32 children with postmeningitic hearing loss, the CT scan had only a 53% accuracy in assessing cochlear ossification. Since 69% of these patients were found to have some degree of cochlear ossification, otologists should expect to encounter some degree of bony obstruction within the basal turn of the cochlea even when the CT scan is normal. Nevertheless, cochlear implantation can successfully be performed in these cases.
在评估患者是否适合进行人工耳蜗植入时，内耳结构的计算机断层扫描（CT）成像很有帮助。评估了CT扫描成像在确定是否存在耳蜗骨化方面的准确性。对104例植入患者的病历、手术报告和CT扫描进行了回顾性研究。在纳入研究的患者中，78%的CT扫描结果与手术结果一致。22%的患者在手术中发现有骨化，但影像学检查未检测到。一名患有广泛耳海绵化且CT扫描显示耳蜗阻塞的患者，磁共振成像（MRI）显示耳蜗通畅，手术结果证实了这一点。在32例脑膜炎后听力损失的儿童中，CT扫描在评估耳蜗骨化方面的准确率仅为53%。由于这些患者中有69%被发现有一定程度的耳蜗骨化，即使CT扫描正常，耳科医生也应预期在耳蜗底转内会遇到一定程度的骨质阻塞。尽管如此，在这些病例中仍可成功进行人工耳蜗植入。
