Fig. 3
a Magnetic resonance image on which the definitive diagnosis of ossification of the posterior longitudinal ligament of the cervical spine on 27 August 2012, was based. The arrows indicate the ossification of the posterior longitudinal ligament of the third cervical spine. b Magnetic resonance image of the ossification of the posterior longitudinal ligament of the cervical thoracic spine on 15 November 2017. A new ossification of the posterior longitudinal ligament was confirmed in the fourth thoracic vertebra (arrows)