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Updated: Aug 21, 2026

Transient Middle Cerebral Artery Occlusion Model of Stroke
Published on: August 11, 2023
Type I proatlantal artery with bilateral absence of the external carotid arteries
C Cinar Basekim1, Emir Silit, Hakan Mutlu
1Department of Radiology, GATA Haydarpasa Training Hospital, Istanbul, Turkey.
Abstract:
During color Doppler examination of a 41-year-old man who presented with vertigo, a right vertebral artery could not be found. Both MR angiography and digital subtraction angiography revealed a large anastomotic vessel between the right internal carotid and vertebral artery. It was thought to be type I proatlantal artery. Furthermore, the external carotid arteries were bilaterally absent. Although each vascular anomaly mentioned above is rare, it even more rare for these variations to occur simultaneously.
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