Continuous ossification of the posterior longitudinal ligament

Ossification of the posterior longitudinal ligament. Midline sagittal cervical spine CT image shows smooth linear ossification along the posterior longitudinal ligament (arrow) extending continuously from C2 to C5, resulting in spinal canal stenosis. This patient had previously undergone anterior cervical discectomy and fusion with instrumented hardware (dashed arrow) at C5-C6 to treat spinal canal stenosis from ossification of the posterior longitudinal ligament at these levels.