FIGURE 9.  Incipient fracture of right L5 pedicle/pars interarticularis area in young athlete. (A and E) Sagittal and transaxial T2-weighted MR images of incipient pars fracture. Arrows point to incomplete linear defect within, surrounded by edema. (B, C, and F) Bone scan localizing and confirming lesion in right L5 pars interarticularis area (arrows). (D) MIP of emission-only scan of patient. Note sharply defined lesion not obscured by bone edema.