Fig. 4

T2-weighted sagittal (a) and transverse (b) MR images of the cervical region of the 8-week-old weaner showing a collapse of the cranial aspect of the seventh vertebral body. Note the C6/7 nucleus pulposus volume reduction of approximately 50%. The C7 vertebral body reveals a heterogeneous signal intensity and an irregular, ill-defined cranial end plate. Dorsally, a well-defined, 20 mm long extradural, heterogeneous mushroom-shaped hyperintense structure (arrows) extruding into the vertebral canal in the ventral right-sided aspect of the spinal canal resulting in a compression and left dorsolateral dislocation of the spinal cord (S). The material occupied up to 75% of the vertebral canal. L = left, C6 = sixth cervical vertebra, Th1 = first thoracic vertebra