Spine

Central canal

• Rule of thumb:
  • >12mm is normal for any spinal level
  • 8-12 is mild stenosis
  • 4-8 is moderate
  • 0-4 is severe
• However generally 10 mm is the more commonly taught threshold

MR

• Use T1 sagittal to look at neural foramen
  • Though fat is bright on the T2 as well, an extruded disc will also be bright and might be mistaken for fat