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a A 15-year-old girl with a single thoracic AIS, type A, in which the NV is the same as the EV. The distal fusion level is T12 (NV) and the direction of the DVR of the distal NV is the opposite direction compared with the thoracic DVR. b The patient is treated with the rod derotation and DVR, and the postoperative radiographs show a well balanced spine
