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June 1980

The Proatlantal Intersegmental Artery: A Case Report and Review of the Literature

Author Affiliations

From the Departments of Neurology (Dr Obayashi) and Radiology (Dr Furuse), Jichi Medical School and Hospital, Tochigi-ken, Japan.

Arch Neurol. 1980;37(6):387-389. doi:10.1001/archneur.1980.00500550089018

• 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.

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