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. 2022 Jul;12(7):3947–3986. doi: 10.21037/qims-2022-04

Figure 21.

Figure 21

MRI of spondylolysis. (A) Sagittal STIR image of grade 1 spondylolysis showing edema without pars interarticularis defect (arrow). (B) Grade 2 spondylolysis, partial defect with edema (arrow). (C) Grade 2A spondylolysis, partial defect without edema (arrow). (D) Grade 3 spondylolysis, complete defect with edema (arrow). (E) Grade 4 spondylolysis, chronic defect without edema (arrow). (F) Bilateral pedicle spondylolysis (arrow). MRI, magnetic resonance imaging; STIR, short tau inversion recovery.