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Patient with severe cervical spinal cord compression. (A) Sagittal T2-MRI sequence shows a level of maximal compression—C5/6 (arrow); (B) Compression ratio: anterior–posterior diameter (solid line double arrow) divided by the transverse diameter (dashed line double arrow) of the spinal cord on the axial T2 MRI image (taken at the level of maximum spinal cord compression; the result is 0.37 in this patient).
