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Spondylolysis in a 13-year-old girl. A, 99mTc-MDP SPECT scan demonstrates increased uptake in the region of the right pars interarticularis of L5. B, Axial helical CT image demonstrates bilateral spondylolysis at L5. C, Sagittal 2D reconstruction image shows extension of the right pars fracture into the right L5 superior facet.
