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Spinal stenosis is the narrowing of spaces in the spine (backbone) which causes pressure on the spinal cord and nerves. About 75% of cases of spinal stenosis occur in the low back (lumbar spine).
spinal cord. that part of the central nervous system lodged in the spinal canal, extending from the foramen magnum to a point in the lumbar or sacral vertebrae, depending on the species. spinal cord abscess. see spinal abscess.