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(A) Type 1b: dysplastic transverse process (≥19-mm width). (B) Type 2b: incomplete sacralization/lumbarization (pseudoarthrosis between the transverse process with adjacent sacral ala). (C) Type 3b: complete sacralization/lumbarization (completely fused transverse process and adjacent sacral ala). (D) Type 4: mixed (type 2 on one side and type 3 on the other). Type a: unilateral. Type b: bilateral.
