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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).
spina bifida occulta, defective closure of the laminae of the vertebral column in the lumbosacral region without hernial protrusion of the spinal cord or meninges. The defect, which is quite common, occurs in about 5% of the population.