Unilateral common carotid artery agenesis: Case report of a rare incidental finding

This case report follows a 60-year-old female with a history of hypertension, diabetes, and Factor V Leiden mutation with multiple prior deep vein thromboses (DVT) in the lower extremities who presented with right eye vision loss. Computed tomography angiogram (CTA) of the neck showed a 4 vessel arch anatomy with an absence of the left common carotid artery and separate origins of the left internal and external carotid arteries directly arising from the arch, which was an incidental finding. This case contributes to the sparse existing literature and highlights the extremely rare occurrence of complete carotid artery agenesis and its clinical implications.