Inal Mikail, Burulday Veysel, Bayar Muluk Nuray, Kaya Ahmet, Şimşek Gökçe, Ünal Daphan Birsen
Kirikkale University, School of Medicine, Department of Radiodiagnostics, Kirikkale, Turkey.
Kirikkale University, School of Medicine, Department of Otolaryngology, Kirikkale, Turkey.
J Craniomaxillofac Surg. 2016 Aug;44(8):998-1002. doi: 10.1016/j.jcms.2016.06.006. Epub 2016 Jun 16.
We investigated the semicircular canal (SC) dehiscence using temporal computed tomography (CT) and magnetic resonance (MR) imaging.
We retrospectively reviewed 114 (228 ears) consecutive MR images and CT scans of the temporal bones for dehiscence of the SCs. In the 1.5 Tesla (T) MR imaging, T1 and T2-weighted images were obtained. Dehiscence of the SCs was defined by absence of high attenuation bone coverage on the CT scans, and absence of low-signal bone margins on the MR images.
Superior SC dehiscence was detected in 4 (1.8%) ears using CT scans and 5 (2.2%) ears using MR imaging. Posterior SC dehiscence was detected in 4 (1.8%) ears using CT scans and 4 (1.8%) ears using MR imaging. In the non-dehiscent cases, there was hypointense bone coverage between the canal and the cerebrospinal fluid (CSF). However, in the cases of semicircular canal dehiscence, hypointense bone tissue did not appear between the canal and the CSF in the MR imaging.
If there is clinical doubt about the presence of SC dehiscence, we recommend that MR imaging be conducted first. When dehiscence is not seen in the MR, a CT examination should be performed. MR imaging is preferred primarily, because it does not contain ionizing radiation.
我们利用颞骨计算机断层扫描（CT）和磁共振成像（MR）对半规管（SC）裂开进行了研究。
我们回顾性分析了114例（228耳）颞骨的连续MR图像和CT扫描，以观察半规管裂开情况。在1.5特斯拉（T）的MR成像中，获取了T1加权和T2加权图像。半规管裂开的定义为CT扫描上无高衰减骨覆盖，以及MR图像上无低信号骨边缘。
使用CT扫描在4耳（1.8%）中检测到上半规管裂开，使用MR成像在5耳（2.2%）中检测到。使用CT扫描在4耳（1.8%）中检测到后半规管裂开，使用MR成像在4耳（1.8%）中检测到。在非裂开病例中，半规管与脑脊液（CSF）之间有低信号骨覆盖。然而，在半规管裂开的病例中，MR成像显示半规管与脑脊液之间未出现低信号骨组织。
如果临床上对半规管裂开的存在有疑问，我们建议首先进行MR成像。当MR成像未发现裂开时，应进行CT检查。主要首选MR成像，因为它不包含电离辐射。
