CTA-Based Vertebral-Level Origin, Transverse-Foramen Entry, and V1 Loop Morphology of the Vertebral Artery.
PURPOSE This study evaluated proximal extracranial vertebral artery (VA) anatomy on computed tomography angiography (CTA), using three side-specific variables: vertebral level of arterial origin, transverse-foramen entry level, and V1 loop morphology. METHODS Seventy-five CTA cases were reviewed, yielding 150 side-sp...