• A case of the proatlantal intersegmental artery (PIA) arising from the external carotid artery (ECA) is presented. The PIA gave rise to the occipital artery, a finding which may support the hypothesis that the distal part of the occipital artery is derived from it. The possibility that the PIA of ECA origin might be a hypertrophied collateral occipital artery is also suggested. The importance of the anteroposterior view in differentiating the PIA of ECA origin from the first cervical intersegmental artery is stressed.
Obayashi T, Furuse M. The Proatlantal Intersegmental Artery: A Case Report and Review of the Literature. Arch Neurol. 1980;37(6):387–389. doi:10.1001/archneur.1980.00500550089018
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