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Osseous cores observed in the sections perpendicular to the long axis of the spheno-occipital synchondrosis. (A) Single circle in the left part (an 8.2-year-old boy in the Class III group). (B) Single circle in the center part (an 11-year-old girl in the Class III group). (C) Multiple circles in the whole region (a 12.3-year-old girl in the Class I group). (D) Column in the whole region (a 12.4-year-old girl in the Class I group).
