The circle of Willis (COW) is an arterial ring located at the base of the brain that connects the internal carotid and vertebral arteries through anastomotic branches. This circle includes two anterior cerebral arteries (ACA) connected by the anterior communicating artery (AComA) in the anterior part; two posterior cerebral arteries (PCA) linked to the carotid system via the posterior communicating arteries (PCom), along with the basilar artery in the posterior part. Collateral circulation in the COW is important in maintaining adequate cerebral blood flow in cases of obstructive arterial diseases. This study aimed to reveal the frequency of each COW variation detected on magnetic resonance imaging (MRI) time-of-flight images.
Bingöl et al. (Fri,) studied this question.
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