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lumbosacral stenosis Narrowing of the spinal canal causing the intervertebral disk between the most caudal lumbar vertebra and the sacrum to bulge and compress the nerve roots (they resemble the tail of a horse) which occupy the canal below the spinal cord; compression could lead to signs such as back pain, paresis;  also called cauda equina syndrome. ►click here to learn more-link provided by: www.acvim.org ►click here to learn more-link provided by: www.peteducation.com Related Words caudal  ;  intervertebral disk  ;  lumbar  ;  nerve root  ;  paresis  ;  sacrum  ;  spinal canal  ;  spinal cord  ;  vertebra