Department of Diagnostic Radiology, International University of Health and Welfare, Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo, 108-8329, Japan.
Department of Radiology, Saitama Sekishinkai Hospital, 2-37-20 Irumagawa, Sayama, Saitama, 350-1305, Japan.
Surg Radiol Anat. 2023 Aug;45(8):959-962. doi: 10.1007/s00276-023-03182-z. Epub 2023 Jun 20.
To describe a case of persistent trigeminal artery (PTA)-superior cerebellar artery (SCA) segmental fusion incidentally diagnosed on magnetic resonance (MR) angiography.
A 53-year-old woman with a history of facial pain underwent cranial MR imaging and MR angiography. MR angiography showed a left lateral-type PTA arising from the precavernous portion of the left internal carotid artery (ICA). PTA branched into the left distal SCA and showed segmental fusion with the proximal SCA at the distal part of the PTA. We also diagnosed an unruptured cerebral aneurysm at the junction between the left ICA and PTA.
PTA is the most frequent type of carotid-vertebrobasilar anastomosis. The reported prevalence rate is 0.2% by angiography and 0.34% by MR angiography. There are two types of PTA-lateral (usual) and medial (intrasellar). SCA arising from the lateral-type PTA has rarely been reported. Further, a PTA from which the distal SCA branches and segmentally fuses with the proximal SCA at the distal part of the PTA has not been reported.
Using MR angiography, we diagnosed a rare type of PTA that fused segmentally with SCA. No similar case has been reported in relevant English-language literature.
描述一例偶然在磁共振血管造影（MRA）上诊断出的持续性三叉动脉（PTA）-小脑上动脉（SCA）节段性融合病例。
一名 53 岁女性，有面部疼痛病史，行颅脑磁共振成像和 MRA 检查。MRA 显示左侧外侧型 PTA 发自左侧颈内动脉（ICA）海绵窦段前段。PTA 分支为左侧远端 SCA，并在 PTA 的远端与近端 SCA 呈节段性融合。我们还诊断出左侧 ICA 和 PTA 交界处的未破裂脑动脉瘤。
PTA 是颈内-椎基底动脉吻合中最常见的类型。血管造影的报告发生率为 0.2%，MRA 为 0.34%。PTA 有两种类型：外侧型（常见）和内侧型（鞍内型）。发自外侧型 PTA 的 SCA 很少见。此外，从 PTA 分支并在 PTA 的远端与近端 SCA 呈节段性融合的 SCA 也未见报道。
我们使用 MRA 诊断了一种罕见的与 SCA 节段性融合的 PTA 类型。在相关的英文文献中没有类似的病例报道。
