Figure 1
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Measurement of canal encroachment in axial section of MRI. A = cross-sectional area of canal one level above the site of maximum compression, B = area occupied by spinal cord at maximum compression, C = cross-sectional area of canal one level below site of maximum compression. Average canal area (D) = A + C/2. Percentage of canal encroachment = D − B/D × 100.
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