Neuro-angiographical findings. Computed tomography angiography in volume-rendering (A-C, A: anterior-posterior view, B: right anterior oblique view, C: left anterior oblique view) and source axial images (D-K) showing 4 atypical branches of the left aortic arch (LAA), proximal-to-distal progression, left common carotid artery (LCCA, white closed arrows in A-C), right common carotid artery (RCCA, white open arrows in A-C), right subclavian artery (RSubA, blue closed arrows in A-C) and left subclavian artery (LSubA, blue open arrows in A-C) originate from the LAA.