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(4-1) Preoperative radiographs show a Chance fracture of T12 (AO type B2) in a 72-year-old male patient. (4-2) A confirmation CT scan demonstrates grade II lateral cortical breach of the right T9 pedicular screw (3.5 mm) after TPS fixation of T9-L. (4-3) A postrevision CT scan of T9 shows the position of the revised screw. CT = computed tomography, TPS = transpedicular screw.
