Ossification of the posterior longitudinal ligament at the craniocervical junction presenting with Brown-Séquard syndrome: A case report.

Background: Several case reports about spinal cord compression due to hyperostosis at the craniocervical junction are available. However, compression at C1-C2 solely due to ossification of the posterior longitudinal ligament (OPLL) is rare.

Case Description: A 50-year-old Asian male, with a history of lumbar spinal canal stenosis, presented with a progressive quadriparesis within 3 months.