There is very mild left sided scoliosis on the coronal sequences. There is prominent fatty signal change in the left L5 pedicle and pars. There does appear to be discontinuity through the pars, with the overall imaging features possibly indicating a chronic left L5 pars defect. The right L5 pars appears intact and no other neural arch or facet joint abnormality is demonstrated. No lesion is seen within the presacral space. A localised CT study of the lumbosacral junction could be performed to confirm presence of a left L5 pars defect.