Anastomosis between internal carotid artery and anterior cerebral artery with other anomalies of the circle of Willis in a fetal brain

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✓ A rare vascular anomaly was found in a 21-week-old fetal brain. It consisted of an anastomotic loop between the internal carotid artery and the anterior cerebral artery. Other variations and anomalies were also found. Anomalies and variations of the circle of Willis are probably genetically determined and develop at an early embryonic stage. They are frequently found in association with other cerebrovascular diseases, such as aneurysms.

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Address reprint requests to: Zoran Milenković, M.D., Neurosurgical Clinic, University of Ni, 18.000-Ni, Yugoslavia.

© AANS, except where prohibited by US copyright law.

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    A and B: Photograph and diagram of the anastomotic loop between the internal carotid artery and the anterior cerebral artery. C, D, and E: Photographs and diagram of the circle of Willis with vascular anomalies. ICA = internal carotid artery; ACA = anterior cerebral artery; A1 and A2 = A1 and A2 segments of the ACA; r and l = right and left; ACoA = anterior communicating artery; Hy = hypothalamic artery; al = anastomotic loop; MCA = middle cerebral artery; dMCA = duplication of the MCA; AChA = anterior choroidal artery; PCoA = posterior communicating artery; CT = common trunk; PCA = posterior cerebral artery; PCAa = accessory PCA; pa = perforating arteries; av = anastomotic vessel; BA = basilar artery; OCh = optic chiasm; TL = temporal lobe; ON = optic nerve.

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