From the Department of Neurological Surgery, Juntendo University Urayasu Hospital, Urayasu, Chiba.
Division of Radiological Technology, Medical Satellite Yaesu Clinic, Tokyo, Japan.
J Comput Assist Tomogr. 2021;45(5):749-752. doi: 10.1097/RCT.0000000000001202.
The present study aimed to explore the relationship between the arcuate eminence (AE) and superior semicircular canal (SSC) using the constructive interference steady-state (CISS) sequence.
After conventional magnetic resonance imaging, a total of 71 patients underwent the CISS sequence in thin-sliced coronal sections.
In all patients, the SSC was delineated on both sides. In contrast, the AE was identified only in 29 of 71 patients (40.8%) on both sides, varying in shape and relative location to the SSC in the mediolateral dimension. The shortest distance between the highest point of the SSC and middle fossa floor was 1.3 ± 1.1 mm on the right side and 1.3 ± 0.9 mm on the left with considerable variability. A dehiscent SSC with a distance less than 0.2 mm was found in 11.3% of 142 sides. On 22 sides (15.5%), the site on the middle fossa floor, reaching the SSC with the shortest distance (reference point) corresponded to the apex of the AE, equally on the right and left. On 36 sides (25.4%), the distance between the reference point and the apex of the AE was measured as 3.0 ± 1.1 mm on the 18 right sides and 3.7 ± 1.6 mm on the 18 left sides.
The relationship between AE and SSC is highly variable. Arcuate eminence was not a reliable landmark of the SSC. High-resolution CISS sequence is useful for exploring these structures.
本研究旨在使用稳态干扰结构（CISS）序列探讨弓状隆起（AE）与上半规管（SSC）之间的关系。
在进行常规磁共振成像后，共有 71 例患者接受了薄层冠状 CISS 序列检查。
所有患者的 SSC 均在两侧被描绘出来。相比之下，AE 仅在 71 例患者的两侧（40.8%）被识别出来，其形状和在中侧维度上与 SSC 的相对位置各不相同。SSC 最高点与中颅窝底之间的最短距离右侧为 1.3 ± 1.1mm，左侧为 1.3 ± 0.9mm，具有相当大的可变性。142 侧中有 11.3%发现 SSC 存在裂隙，距离小于 0.2mm。在 22 侧（15.5%）中，到达 SSC 的最短距离（参照点）所在的中颅窝底部位与 AE 的顶点相对应，左右两侧相等。在 36 侧（25.4%）中，参照点与 AE 顶点之间的距离在 18 侧右侧为 3.0 ± 1.1mm，在 18 侧左侧为 3.7 ± 1.6mm。
AE 和 SSC 之间的关系具有高度变异性。AE 不是 SSC 的可靠标志。高分辨率 CISS 序列可用于探索这些结构。
