Surgical and Radiologic Anatomy ( IF 1.2 ) Pub Date : 2022-07-03 , DOI: 10.1007/s00276-022-02975-y Akira Uchino 1 , Shoichiro Ishihara 2
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Purpose
The purpose of the study is to describe a case of ophthalmic artery (OA) arising from the presumed meningohypophyseal trunk (MHT) of the cavernous internal carotid artery (ICA).
Case report
A 63-year-old woman suspected of having cerebral infarctions underwent cranial magnetic resonance (MR) imaging and MR angiography. MR angiography showed a right OA that was found to arise from the superolateral aspect of the proximal cavernous ICA. This OA entered the orbit via the superior orbital fissure (SOF).
Discussion
Rarely, an OA arises from the inferior aspect of the middle cavernous ICA at the level of the inferolateral trunk (ILT) and enters the orbit via the SOF. This OA variation was traditionally regarded as a persistent primitive dorsal OA but is now believed to be due to the persistence of the lateral branch of the primitive maxillary artery. The present case had an OA arising from the superolateral aspect of the more proximal cavernous ICA than the origin of the ILT, which was suggested to be the origin of the MHT. Persistence of the proximal segment of the trigeminal artery may play an important role in the formation of this extremely rare variation.
Conclusion
To identify this extremely rare OA variation, careful observation of source images and the creation of volume-rendering MR angiography images are important.
中文翻译：
由磁共振血管造影诊断的颈内海绵状动脉的假定脑膜垂体干产生的眼动脉
目的
本研究的目的是描述一例由推测的颈内动脉海绵状动脉 (ICA) 的脑膜垂体干 (MHT) 引起的眼动脉 (OA) 病例。
案例报告
一名怀疑患有脑梗塞的 63 岁女性接受了颅磁共振 (MR) 成像和磁共振血管造影。MR 血管造影显示右侧 OA，发现其起源于近端海绵状 ICA 的上外侧。该 OA 通过眶上裂 (SOF) 进入轨道。
讨论
罕见情况下，OA 起源于下外侧干 (ILT) 水平的中海绵状 ICA 的下方，并通过 SOF 进入眼眶。这种 OA 变异传统上被认为是持续性原始背侧 OA，但现在认为是由于原始上颌动脉外侧分支的持续存在。本病例的 OA 起源于更近端的海绵状 ICA 的上外侧，而不是 ILT 的起源，这被认为是 MHT 的起源。三叉动脉近端段的持续存在可能在这种极其罕见的变异的形成中起重要作用。
结论
为了识别这种极其罕见的 OA 变异，仔细观察源图像和创建体积渲染 MR 血管造影图像非常重要。
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