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Previous studies have found a significant difference in the prevalence of anatomical variants of the cerebral arterial circle among different ethnic groups (De Silva et al, 2009; Klimek-Piotrowska et al.
These differences could be attributed to a lower sensitivity of imaging studies for detecting anatomical variants of small and hypoplastic vessels such as the AComA, indicating that if this vessel is not seen it does not necessarily mean it is not present; however, it has been described that CTA has a high sensitivity and specificity in detecting absence and in measurement of the arterial segments of the cerebral arterial circle (Han etal, 2011) (Table I and II).
In Mexico, there are two studies of the anatomical variants of the cerebral arterial circle.