Unstable atlanto axial joint, with extensive ligamentous injury resulting in pathological widening of the median and lateral atlantoaxial joints, with disruption of the both the anterior and posterior longitudinal ligaments at this level. This is associated with pre-dentate space widening, with partial disruption of the anterior atlantoaxial membrane, disruption of the transverse ligament, corrugated in appearance and avulsed on the left side, and with disruption of the longitudinal band of the cruciform ligament as well. Increased STIR signal within the region of the ligamentum nuchae/interspinous ligament at C1/2 and C2/3 levels. There is an associated haemorrhagic contusion and oedema of the spinal cord and medulla evidenced by elevated T2 signal extending from the inferior half of the medulla to mid-C3 level.