====== Schizas classification ======
see [[https://operativeneurosurgery.com/doku.php?id=lee_classification_for_lumbar_foraminal_stenosis]]
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Grade A: no or minor [[lumbar spinal stenosis]]

A1: [[root]]lets lying dorsally and occupying less than half of the [[dural sac]] area.

A2: rootlets lying dorsally with a horseshoe configuration

A3: rootlets lying dorsally and occupying more than half of the dural sac area

A4: rootlets lying centrally and occupying the majority of the dural sac area
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Grade B: moderate stenosis: rootlets occupying the entire dural sac, but rootlets can still be individualized
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Grade C: severe stenosis: no recognizable rootlets with complete effacement of cerebrospinal fluid space, but epidural fat is present posteriorly
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Grade D: extreme stenosis: no recognizable rootlets and no epidural fat posteriorly
((Lee, E., Lee, J. W., Park, C. Y., Cho, J., Kang, Y., & Ahn, J. M. (2020). Clinical validity of two different grading systems for lumbar central canal stenosis: Schizas and Lee classification systems. PLOS ONE, 15(5), e0233633. https://doi.org/10.1371/journal.pone.0233633))

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