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e-CASES: Normal diameters of lumbar central canal on CT and MR - Lumbar spinal stenosis

Dr Antoine Micheau

Normal diameters of lumbar central canal on CT and MR

AP diameter and midsagittal diameter of lumbar central canal:

- Normal >13 mm

- AP diameter 10-13mm = “relative stenosis”

- AP diameter <10mm = “absolute stenosis”

 

 

Thecal sac transverse diameter:

- Normally 16-18mm

- Stenosis < 15 mm

 

Cross-sectional area normally >100mm²

- 76-100mm² = moderate stenosis

- ≤75mm² = severe stenosis

 

 

Lateral recess (subarticular or entrance zone)

Narrowest at superior border of pedicle :

- > 5mm in height

- 3-5mm “relative stenosis”

- < 3 mm “absolute stenosis”

Diagnosis

Lumbar spinal stenosis



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