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A 14-year-old girl had a residual fusion mass shift (FMS) of 24 mm with postoperative adding-on phenomenon developing despite good correction of the fusion mass Cobb (FMC) angle. (A) The Cobb angle was 48° from T5 to L1 before surgery. (B) Immediately postoperative, the fusion mass Cobb angle was 4.5°. (C) At the 2-year followup, the fusion mass Cobb angle was 8° with distal adding-on phenomenon.
