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Schizas’ classification.
Grade A: Cerebrospinal fluid (CSF) is clearly visible inside the dural sac.
Grade B: CSF is reduced but still present. The nerves can still be individualized inside the dural sac.
Grade C: Moderate stenosis. CSF disappears, and nerves cannot be individualized within the dural sac. Epidural fat is abundant posteriorly.
Grade D: Severe stenosis. Nerves cannot be individualized, and epidural fat is also significantly reduced.
