Figure 4. Compression of the radicular artery (anterior spinal artery syndrome caused by a median disk prolapse). A, Sagittal T2-weighted fast spin-echo magnetic resonance imaging sequence (repetition time, 4700 milliseconds; echo time, 112 milliseconds; 3-mm-section thickness; number of signals required, 3; with a 1024x360-pixel matrix) showed a lesion in the territory of the anterior spinal artery. Arrows indicate the extent of the infarct. B, Coronal section of another patient with a lateral herniated disk (right arrow) at the level of the radicular artery corresponding to the cord infarction (left arrow).