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Radiographs demonstrate the Castellvi classification of LSTV: (a) Type I: dysplastic enlarged transverse process (arrow); (b) Type II: pseudoarticulation of the transverse process with the sacrum with increased sclerosis (arrows); (c) Type III: fusion with the sacrum (arrows); (d) Type IV: unilateral LSTV type II (long arrow) with type III on the contralateral side (short arrow).
