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Volume rendering reconstruction images of the anterior aspect of the lumbar vertebrae in case of thirteenth ribs (lumbar ribs) and lumbarization of S1. (A) If the lowest ribs are interpreted as 12th ribs (white arrows), the lumbar spinal configuration might be identified as sacralization. (B) By counting inferiorly from C1, the lowest ribs are confirmed as thirteenth ribs and the lowest incomplete-fused vertebra as S1 (lumbarization).
