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Document Type

Case Report

Abstract

The azygos anterior cerebral artery (AACA) is an uncommon anatomical variant. There is absence of the anterior communicating artery (ACom) and bilateral anterior cerebral arteries (ACA) form a common trunk and travels superiorly in the interhemispheric fissure. It can result in bilateral frontal infarcts in case of thromboembolism. Therefore its correct diagnosis is of grave importance for better patient clinical outcome. Cerebrovascular infarction is a common condition, however simultaneous symmetrical bilateral infarction secondary to arterial occlusion is a rare entity. We report a case of a 50 years male with thromboembolic event in azygos anterior cerebral artery resulting in bifrontal cerebral infarcts with associated hypoplasia of right cerebral artery. Normally the paired ACAs are connected by the anterior communicating artery to complete the anterior portion of the circle of Willis. These arteries then supply the medial surface of each cerebral hemisphere. However in azygos ACA the ACom is absent and bilateral ACA has common A2 segments. In humans the incidence of unpaired ACA is rare with an incidence between 0.3-2 % .

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