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FIG 4. CT scan obtained in patient 17, a 25-year-old male patient. Coronal view multiplanar reconstruction scan shows the ASA (small white arrow) as visualized from the top of the scanning range. The radiculomedullary artery is not detected. The upper level of the scanning range is T11 level for this patient. The AKA is expected to arise from a more cranial level.
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