Extradural extrusion of roots of the cauda equina.

For lumbar spondylotic stenosis causing progressive disability, multiple laminectomy was about to be completed. Suddenly roots of the cauda equina herniated through the myelography puncture site in the dura mater, resembling redundant nerve roots. This case is being reported not only because such sudden extradural extrusion is rare, but also to raise the question of the relationship of redundancy of nerve roots to spondylotic stenosis.