. "Posterior Longitudinal Ligament Ossification"@en . "D017887" . . "Ossification of Posterior Longitudinal Ligament"@en . . . "Calcification of Posterior Longitudinal Ligament"@en . . "90448008" . . "Ossification of Posterior Longitudinal Ligament"@en . "Posterior Longitudinal Ligament Calcification"@en . "C0206366" .