Lumbar Canal Stenosis Caused by Marked Bone Overgrowth after Decompression Surgery

Figure 1

Radiographic images before and after the first surgery. (a) Computed tomography (CT) myelogram before the first surgery showing central canal stenosis at L3/L4. (b) Magnetic resonance (MR) image before the first surgery showing central canal stenosis and facet effusions at L3/4. (c) Dynamic X-ray images (neutral, extension, and flexion position) before the first surgery showing mild L3 spondylolisthesis with a 4-mm slip change. (d) CT image 5 days after the first surgery showing unilateral partial laminectomy at L3/L4.

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