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AJNR - American Journal of Neuroradiology

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Aortic Arch Origin of the Left External Carotid Artery and Type II Proatlantal Fetal Anastomosis

Michael Horowitz^a, Surendra Bansal^b and Kush Dastur^b

^a Department of Neurosurgery and Radiology, Presbyterian Hospital, University of Pittsburgh Medical Center, PA
^b Department of Radiology, Mercy Hospital, Pittsburgh, PA

View larger version (158K): [in a new window]   FIG 1. Oblique view of the AA shows the left ECA (solid arrow) and the left ICA (open arrow) arising separately from the AA.

View larger version (95K): [in a new window]   FIG 2. Anteroposterior (AP) view of the nonbranching ICA.

View larger version (95K): [in a new window]   FIG 3. Lateral view of the nonbranching left ICA.

View larger version (105K): [in a new window]   FIG 4. Lateral view of left the ECA (bottom solid arrow), type II proatlantal intersegmental artery (top solid arrow), and vertebral artery (open arrow).

View larger version (105K): [in a new window]   FIG 5. Nonsubtracted image of Figure 4 shows the relationship of the arteries to the spinal levels.