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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 25:1622-1624, October 2004
© 2004 American Society of Neuroradiology

Case Report
HEAD AND NECK

Bilateral Persistence of Type 1 Proatlantal Arteries: Report of a Case and Review of the Literature

Terman Gumus^a, Baran Önal^a and Erhan T. Ilgit^a

^a From the Department of Radiology, Gazi University School of Medicine, Ankara, Turkey

Address correspondence to Terman Gumus, MD, Department of Radiology, Gazi University School of Medicine, Besevler, Ankara 06510, Turkey

Summary: Persistent proatlantal artery type 1 is one of the four anastomotic vessels between the carotid and vertebrobasilar arterial systems. Persistence of this embryonic anastomosis is extremely rare. We present such a case with bilateral persistent proatlantal arteries that arose from internal carotid arteries, entered the skull via the foramen magnum and united with the horizontal portions of vertebral arteries. We also mention its embryology, potential clinical implications, and differentiating features between two types of proatlantal arteries.

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