Hirai T, Korogi Y, Sakamoto Y, Hamatake S, Murakami R, Ikushima I, Takahashi M, Nagahiro S, Ushio Y
Department of Radiology, Kumamoto University School of Medicine, Japan.
J Comput Assist Tomogr. 1995 May-Jun;19(3):495-7. doi: 10.1097/00004728-199505000-00027.
To evaluate the MR angiographic findings of the persistent trigeminal artery variant (PTAV) and to discuss its clinical implications.
We reviewed time-of-flight MR angiography including individual source imaging in three patients with PTAV, which had been recognized as an incidental finding on conventional arteriography. In all cases, MR angiography was performed at 1.5 T.
MR angiography demonstrated the PTAVs as hyperintense structures originating from the precavernous portion of the internal carotid artery, running within or very close to the Meckel cave and near the trigeminal nerve root, and reaching the posterior fossa (cerebellar arteries) without joining the basilar artery. Spin echo imaging failed to demonstrate the PTAVs.
Source imaging of MR angiography helped demonstrate PTAV and its adjacent structure. Knowledge of the presence and course of this anomalous vessel is useful for various treatment strategies.
评估持续性三叉动脉变异（PTAV）的磁共振血管造影表现，并探讨其临床意义。
我们回顾了3例PTAV患者的时间飞跃磁共振血管造影，包括单独的源图像，这些患者的PTAV在传统动脉造影中为偶然发现。所有病例均在1.5T磁场下进行磁共振血管造影。
磁共振血管造影显示PTAV为起源于颈内动脉海绵窦前段的高信号结构，走行于梅克尔腔或其附近、靠近三叉神经根，并到达后颅窝（小脑动脉），未与基底动脉汇合。自旋回波成像未能显示PTAV。
磁共振血管造影的源图像有助于显示PTAV及其相邻结构。了解这种异常血管的存在和走行对各种治疗策略有用。
