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Illustration of the dural sac cross-sectional area measurement technique. a Normal central spinal canal with a dural sac area of 222 mm2. b There is bulging of the disc and facet arthrosis causing a moderate spinal stenosis with a dural sac area of 98 mm2. c In addition to discal bulging and facet arthropathy, there is a left-sided synovial cyst (arrow) which further increases the spinal stenosis and dural sac compression (dural sac area of 57 mm2)
