ArticleSurgical and radiologic anatomy : SRA2025
Semicircular fenestration of the mid M1 segment of the middle cerebral artery diagnosed by magnetic resonance angiography.
Article in Surgical and radiologic anatomy : SRA, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Internal carotid artery-middle cerebral artery junction small arterial ring: A report of two cases diagnosed by magnetic resonance angiography.Radiology case reports · 2026Article
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Abstract
purposeCerebral arterial fenestration is a common occurrence. However, fenestration of the middle cerebral artery (MCA) is uncommon. It is usually observed in the proximal M1 segment and has a small slit-like configuration. We herein report a case of a relatively large semicircular fenestration located in the mid M1 segment of the right MCA.
methodsMagnetic resonance imaging (MRI), including magnetic resonance angiography (MRA), was performed in a 66-year-old man presenting with left homonymous hemianopia for the evaluation of suspected cerebrovascular disease. The MR machine was a 3-Tesla scanner, and MRA was performed using the standard three-dimensional (3D) time-of-flight technique.
resultsMRA demonstrated fenestration in the mid M1 segment of the right MCA. The fenestration appeared in a relatively large semicircular configuration. The superior limb took a semicircular course and was thinner than the inferior limb, and no perforating branches arising from either limb were clearly identified.
conclusionFenestration of the MCA is thought to result from incomplete fusion or partial persistence of the arterial plexus during embryological development and is therefore typically small, slit-like, and located in the proximal M1 segment. However, the morphology observed in this case was markedly different. To our knowledge, only a few similar cases have been reported in the English-language literature.
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