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Spondylolysis in an 8-year-old boy. A, Axial T2-weighted image with fat saturation demonstrates hyperintense signal intensity consistent with bone marrow edema in the region of the pars defects bilaterally. B, Axial CT image demonstrates a complete pars defect of L5 on the right. C, Axial CT image demonstrates an incomplete pars defect of L5 on the left.
