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Osseous cores observed in sagittal sections. (A) Single circle in the middle part (a 9.1-year-old boy in the Class I group). (B) Circles in the superior and inferior parts (a 12.4-year-old girl in the Class I group). (C) Highly radiopaque column in the middle and a circle in the inferior part (an 11.9-year-old boy in the Class I group). (D) Multiple circles in the whole region (a 13.3-year-old boy in the Class III group).
