Ossification of posterior longitudinal ligaments: Evaluation with MRI

Ossification of the posterior longitudinal ligament is a special subcategor y of degenerative disease responsible for compression of the spinal cord, O n MR images, TS-weighted sequences are the most effective to evaluate both spinal cord compression due to the ossification and abnormal signal intensi ty of the cord. Although ossification of the ligaments is well demonstrated on CT and plain radiographs, MRI noninvasively provides useful information about the degree and event of spinal cord compression, as well as the char acter of the ossification.