Teenager with back pain

Radiograph and bone scan of spondylosis
Lateral radiograph of the lumbar spine shows a lucency through the pars interarticularis of the L5 vertebral body (pars defect). Axial and coronal images from a nuclear medicine bone scan show increased radiotracer localization in the right L5 pars interarticularis.

The diagnosis was right-sided L5 spondylolysis.