Examples and prevalence of circle of Willis anomalies that hamper collateral function. Examples and prevalence of circle of Willis anomalies that hamper.

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Presentation transcript:

Examples and prevalence of circle of Willis anomalies that hamper collateral function. Examples and prevalence of circle of Willis anomalies that hamper collateral function. Prevalence is derived from studies by using an external diameter of 1 mm as a threshold for hypoplasia of collateral arteries. A1 indicates the precommunicating part of the anterior cerebral artery; M1, main trunk of the middle cerebral artery; P1, precommunicating part of the posterior cerebral artery; BA, basilar artery; and VA, vertebral artery. Arjan W.J. Hoksbergen et al. AJNR Am J Neuroradiol 2003;24:456-462 ©2003 by American Society of Neuroradiology