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A. Left L1 lumbar arteriogram shows longitudinal artery without hairpin turn. B, C. On coronal (B) and sagittal (C) three-dimensional CT angiograms, artery is paramedian and dorsal to spinal cord (hollow arrow), proven to be prominent left posterior spinal artery. White dotted line demonstrates midline. SDAVF = spinal dural arteriovenous fistula
