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Case Reports in Neurological Medicine
Volume 2016, Article ID 7584384, 5 pages
Case Report

Nonvisualization of the Internal Carotid Artery on Computed Tomography Angiography: Discussion of Two Cases with Review of Literature

Department of Radiology, AIIMS Jodhpur, Jodhpur 342005, India

Received 24 February 2016; Revised 13 April 2016; Accepted 14 April 2016

Academic Editor: Jorge C. Kattah

Copyright © 2016 Sonal Saran et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Nonvisualization of the internal carotid artery (ICA) on cross-sectional imaging studies can be due to congenital (dysgenesis of the ICA) or acquired (complete occlusion of ICA) causes. We report two cases, one with absent carotid canal on bone window setting of computed tomography (CT) suggestive of congenital cause and the other with normal carotid canal, suggesting acquired cause. Development of aortic arches with six pathways of collateral circulation in brain is also discussed.