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FIG 4. Parasagittal multiplanar reformatting.
A, Right-sided parasagittal reconstruction of the spine in multiplanar reformatting modus is shown. The defect of the contrast column at the C5–C6 level indicates nerve root sheath compression and also allows distinction between the compressing disk material and the vertebra (arrow). Inset, multiplanar reformatting with axial orientation of the reconstruction plane at the C5–C6 level shows a narrowing of the neural foramen on the right side. The contrast medium is asymmetrically distributed within the spinal canal, indicating a right paramedian soft disk protrusion with compression of the thecal sac and the spinal cord (arrow). White line marks reconstruction plane in relation to spinal canal.
B, Multiplanar reformatting in oblique parasagittal projection obtained perpendicular to the course of the nerve root canal allows assessment of narrowing of the foramen (arrows). As the inset in A shows (white line shows reconstruction plane), an evaluation of the neural foramen along its course is possible, allowing determination of maximum stenosis.
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