Department of Radiology, Saitama Sekishinkai Hospital, 2-37-20 Irumagawa, Sayama, 350-1305, Saitama, Japan.
Department of Neurosurgery, Saitama Sekishinkai Hospital, 2-37-20 Irumagawa, Sayama, 350-1305, Saitama, Japan.
Surg Radiol Anat. 2024 Oct;46(10):1621-1624. doi: 10.1007/s00276-024-03454-2. Epub 2024 Aug 5.
To describe a case of replaced posterior cerebral artery (PCA) in which all branches of the PCA arose from the anterior choroidal artery (AChA) with an early branching temporal artery.
An 83-year-old man with cerebral infarctions underwent cranial magnetic resonance (MR) imaging and MR angiography using a 3-Tesla scanner. MR angiography was performed using a standard 3-dimensional time-of-flight technique.
A large anomalous artery arose from the supraclinoid segment of the right internal carotid artery (ICA) and supplied all branches of the right PCA, mimicking fetal-type PCA. The temporal branch arose from the proximal segment of this artery. In MR angiographic source images, a tiny artery arose from the right ICA proximal to the origin of the anomalous artery, indicating a hypoplastic right posterior communicating artery (PCoA). Thus, we concluded that the anomalous artery was a replaced PCA; all branches of the PCA arose from the AChA.
We present a case involving a replaced PCA with an early branching temporal artery, as seen on MR angiography. Careful observation of MR angiographic source images is useful for identifying small arteries. To our knowledge, this is the first report of this combined variation in the relevant English-language literature.
描述一例大脑后动脉（PCA）替代的病例，其中 PCA 的所有分支均发自脉络膜前动脉（AChA），伴颞支的早期分支。
一名 83 岁男性因脑梗死行头颅磁共振（MR）成像和 3T 磁共振血管成像检查。MR 血管成像采用标准的 3 维时间飞跃技术。
一条粗大的异常动脉发自颈内动脉（ICA）床突上段，供应右侧 PCA 的所有分支，类似于胎儿型 PCA。颞支发自该动脉的近段。在 MR 血管成像原始图像上，发自右侧 ICA 异常动脉近端的一支细小动脉提示右侧后交通动脉（PCoA）发育不良。因此，我们认为该异常动脉为 PCA 替代，PCA 的所有分支均发自 AChA。
我们在 MR 血管成像上呈现了一例伴颞支早期分支的 PCA 替代病例。仔细观察 MR 血管成像原始图像有助于识别小动脉。据我们所知，这是相关英文文献中首次报道这种联合变异。
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