PMC9072035_01
Three-dimensional reconstructed computed tomography angiography shows the carotid, subclavian, and vertebral arteries. A hypoplastic left vertebral artery originates from the aortic arch and is smaller than the right vertebral artery along its entire course. All mentioned vascular structures show normal caliber and course, smooth intima, and no narrowing or obliteration. AA = aortic arch; BCT = brachiocephalic trunk; LCCA = left common carotid artery; LSCA = left subclavian artery; RCCA = right common carotid artery; RSCA = right subclavian artery; LVA = left vertebral artery; RVA = right vertebral artery.
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fig1
The LVA originated from the aortic arch, between the Left Common Carotid Artery (LCCA) and the Left Subclavian Artery (LSCA) (Figure 1).
Computed tomographic angiography demonstrates the anterior-posterior (a), posterior-anterior (b), and lateral (c) views. AA = aortic arch; BCT = brachiocephalic trunk; LCCA = left common carotid artery; LSCA = left subclavian artery; RCCA = right common carotid artery; RSCA = right subclavian artery; LVA = left vertebral artery; RVA = right vertebral artery.
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fig2
In addition to the abnormal origin, a hypoplastic LVA was observed (Figure 2).