Department of Radiology, Saitama Sekishinkai Hospital, 2-37-20 Irumagawa Sayama, Saitama, 350-1305, Japan.
Department of Diagnostic Radiology, Saitama Medical University International Medical Center, Hidaka, Japan.
Surg Radiol Anat. 2021 Dec;43(12):1947-1950. doi: 10.1007/s00276-021-02765-y. Epub 2021 May 13.
Persistent primitive olfactory artery (PPOA) is a relatively rare variation of the proximal anterior cerebral artery (ACA). Traditionally, there are two types: Type 1 is a common type, which generally follows an anteroinferior course and which takes a hairpin turn before continuing to the A2 segment of the ACA. Type 2 is an extremely rare variation that continues to the anterior ethmoidal artery without a hairpin turn. Since Type 2 PPOAs are small in caliber, previously reported cases were found during anatomical dissection or were detected by catheter angiography. We herein report a case of Type 2 PPOA that was diagnosed by partial-maximum-intensity projection images of magnetic resonance angiography. This patient also had bilateral ophthalmic arteries arising from the middle meningeal artery. These two variations may be related to each other.
永存原始嗅动脉（PPOA）是大脑前动脉近端的一种相对罕见的变异。传统上有两种类型：1 型为常见类型，通常呈前下走行，在继续到大脑前动脉 A2 段之前呈发夹状转弯。2 型为极其罕见的变异，不呈发夹状转弯而继续到额动脉。由于 2 型 PPOA 口径较小，以前报道的病例是在解剖时发现的，或是通过导管血管造影术发现的。我们在此报告一例 2 型 PPOA，通过磁共振血管造影的部分最大强度投影图像进行诊断。该患者还存在双侧眼动脉发自脑膜中动脉。这两种变异可能彼此相关。
