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This report aims to highlight the rare occurrence of internal carotid artery absence and its associated risks.

May 22, 2026Open Access

Internal Carotid Artery Absence: A Case Report and Literature Review

Key Points

This report aims to highlight the rare occurrence of internal carotid artery absence and its associated risks.
Presented a case of type A left ICA agenesis found incidentally through imaging techniques.
Reviewed existing literature on ICA absence and its implications for aneurysm development.
Documented collateral blood supply pathways from type A to type F in ICA absence cases.
Highlighted the lack of screening initiatives and treatments for this anomaly.

Abstract

Internal carotid artery (ICA) absence is a rare congenital vascular anomaly. The resultant collateral blood supply has been categorized into six pathways, from type A to type F. The collateral blood supply often leads to asymptomatic presentations of ICA absence. However, ICA absence is closely linked to the development of aneurysms and their severe consequences, among other signs and symptoms. ICA absence is usually detected incidentally via computed tomography angiography (CTA) or digital subtraction angiography (DSA). There are currently no screening initiatives or treatments. In this case report, the authors will be discussing compiled evidence from various authors who have presented cases of incidentally found type A left ICA agenesis, and the surrounding literature.

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