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. 2012 Jun 3;6(3):237–240. doi: 10.1007/s11832-012-0409-z

Fig. 1.

Fig. 1

a An axial magnetic resonance imaging (MRI) at the level of L5 of a symptomatic patient with spondylolysis. This MRI was interpreted as nondiagnostic for spondylolysis in the radiology report. b An axial computed tomography (CT) scan of the same patient at the same vertebral level showing the pars defect, indicating that this patient has bilateral spondylolysis