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A) Schematic showing the affected (red L5) and unaffected (green L4 or S1) nerve roots B) Sagittal T2-weighted MRI showing left L5 nerve compression in the intervertebral foramen C) schematic showing region of interest (ROI) placement along an L5 nerve root with respect to distance below the L4-L5 disc. Note that ROIs are shown on coronal view for clarity of position along the nerve root.
