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MRI Indirect signs of spondylolysis and spondylolisthesis. (A) Epidural fat interposition between the thecal sac and the L5 spinous process in spondylolysis without spondylolisthesis. (B) Widening of the central canal (arrow) and foraminal stenosis (arrow) (C) in spondylolysis with spondylolisthesis. MRI, magnetic resonance imaging.
