Ossification of Posterior Longitudinal Ligament

Ossification of the posterior longitudinal ligament (OPLL) is well demonstrated by plain radiography but is frequently overlooked. CT scan is a highly reliable modality for evaluating the extent of the lesion, in addition CT myelography images permit an analysis of the degree of encroachment on the spinal canal and compression of the cord. Magnetic resonance imaging noninvasively provides useful information about the degree and extent of spinal cord compression [1].