Ossification of the posterior longitudinal ligament (OPLL)  is typically an entity seen in patients of asian descent, although it is seen in all ethnicities. It is characterized by, as the name suggests, ossification of the posterior longitudinal ligament.  As can be seen in this case MRI and CT are very sensitive and specific studies for this disease with findings sometimes being subtle on plain films. This typically seen in the mid cervical spine and results central canal stenosis, predisposing the patient to cord injury from minor trauma.Its incidence in  cervical - 75%