医学
大脑中动脉
大脑前动脉
神经血管束
解剖
脑动脉
烟雾病
尸体痉挛
大脑后动脉
前交通动脉
脑血管造影
动脉瘤
蛛网膜下腔出血
放射科
血管造影
外科
心脏病学
缺血
作者
Cassius Reis,Joseph M. Zabramski,Sam Safavi–Abbasi,Ricardó A. Hanel,Pushpa Deshmukh,Mark C. Preul,Ziad A. Hage,Edward Duckworth,H. Hunt Batjer,Daniel L. Barrow,Reza Dashti,Mika Niemelä,Juha Hernesniemi,Christopher S. Ogilvy
出处
期刊:Operative Neurosurgery
[Oxford University Press]
日期:2008-07-01
卷期号:63 (1): ONS10-ONS14
被引量:5
标识
DOI:10.1227/01.neu.0000315284.44157.4a
摘要
OBJECTIVE An accessory middle cerebral artery (MCA) usually originates between the A1 and proximal A2 segment of the anterior cerebral artery, reaches the sylvian fissure, and supplies the territory of the MCA. This anomaly has been associated with cerebral aneurysms and Moyamoya disease. We report an accessory MCA arising from the A2 segment. METHODS A cadaveric head, fixed in formalin solution and injected with red and blue silicone on its vascular tree to trace intracranial and extracranial vessels, was dissected. RESULTS An accessory MCA was found arising from the A2 segment of the anterior cerebral artery and feeding the basal and inferior surface of the inferior frontal gyrus. In our specimen, the vessel was associated with intracranial aneurysms at other locations. CONCLUSION Although anomalies of the MCA are rare, neurosurgeons must be familiar with such anatomic variations. An accessory MCA can be associated with Moyamoya disease and aneurysms at its junction with the anterior cerebral artery. Patients with this anomaly may, therefore, have an increased risk for developing aneurysms and other neurovascular complications. By obstructing the surgical view, an accessory MCA may increase the difficulty of exposing lesions in the vicinity of the optic chiasm.
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