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Flow in the ACA is dependent upon the presence of a complete CoW as well as the degree of vasospasm in the proximal ICA and the MCA. Much larger drops in blood flow are seen in the ACA when the CoW is incomplete. ACA, anterior cerebral artery; CoW, circle of Willis; d, distributed spasm; f, focal spasm; Hype, hypertension; ICA, internal carotid artery; L, left vessel; MCA, middle cerebral artery.
