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Figure 15a. Dorsal herniation of an intervertebral bone graft cage in a 41-year-old woman with acute neuropathy. (a) Lateral radiograph depicts posterior interbody fusion at L4–5 and L5-S1 and posterolateral displacement of the L5-S1 bone graft cage into the spinal canal (arrow). The patient was experiencing worsening low back pain and a left L5 radiculopathy. (b) T2-weighted MR image demonstrates ventral and lateral effacement of the thecal sac (arrow) by the cage.
