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disc sequestration
complete separation of disc material with rupture through posterior longitudinal ligament into the epidural space; free fragment herniation
findings:
- migration superiorly/inferiorly with compression of nerve roots above/below the level of herniation
- disc material noted >9mm from disc space
- postoperative scarring (retraction of thecal sac to the site of surgery)
- epidural abscess/tumor
- conjoined nerve root: 2 nerve roots arising simultaneously from the thecal sac; normal variant in 1-3%
see: degenerative disc disease
Yong H. Hahn, MD - 2 February 1995
Last updated: 1 September 2006
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Medical College of Wisconsin