Cervical disc extrusion (herniation). A, T2-weighted sagittal image of the cervical spine reveals extruded C6-C7 disc (arrow). B, Gradient-echo sagittal image demonstrates displaced disc material isointense to nucleus pulposus. Note the absence of cerebrospinal fluid pulsation artifact seen on the T2-weighted image. C, Gradient-echo axial image shows left eccentric extrusion compressing the cervical cord and filling the left neuroforamen (arrow).