An Anatomical Surprise during Cancer Follow-up: The Atypical Origin of the Left Common Carotid Artery

Variations in aortic arch branching may have important clinical implications. One significant variant is the left common carotid artery (LCCA) arising from the brachiocephalic trunk (BT) rather than directly from the aortic arch. A 20-year-old female, previously treated for osteoblastic osteosarcoma, underwent routine follow-up magnetic resonance angiography. Imaging demonstrated the LCCA originating from the BT. Although typically asymptomatic, this variant is a clinically significant pattern that can complicate surgical or endovascular procedures, particularly carotid stenting. Preoperative recognition is essential for safe vascular interventions.