Estrem S A, Vessely M B, Oro J J
Division of Otolaryngology, University of Missouri Hospital and Clinic, Columbia, MO 65212.
Otolaryngol Head Neck Surg. 1993 Mar;108(3):293-7. doi: 10.1177/019459989310800314.
The use of MRI for the evaluation of lesions in the internal auditory canal presents a potential pitfall in the diagnosis of bony lesions of the IAC, because bone is poorly visualized with this method of imaging. The presence of marrow in an osteoma might aid in its detection, since fat in the marrow has a bright signal intensity of T1-weighted imaging. Computed tomography remains the imaging modality of choice for bony lesions of the temporal bone. We demonstrate a case of IAC osteoma in which surgical removal resulted in improvement of symptoms. The gross and microscopic appearance of the IAC osteoma in this case is similar to the characteristic findings of osteomas of the EAC. This suggests that the criteria applied to osteomas and exostoses of the EAC may also be used to differentiate bony lesions of the IAC.
使用磁共振成像（MRI）评估内耳道病变时，在诊断内耳道骨病变方面存在一个潜在陷阱，因为用这种成像方法对骨骼的显示不佳。骨瘤中骨髓的存在可能有助于其检测，因为骨髓中的脂肪在T1加权成像上具有明亮的信号强度。计算机断层扫描仍然是颞骨骨病变的首选成像方式。我们展示了一例内耳道骨瘤病例，手术切除后症状得到改善。该病例中内耳道骨瘤的大体和显微镜下表现与外耳道骨瘤的特征性发现相似。这表明应用于外耳道骨瘤和外生骨疣的标准也可用于鉴别内耳道的骨病变。
