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(A,B) Sagittal and coronal computed tomography scans demonstrate diastasis of the occiput on C1 (arrowheads) and widening the distance between C1 and C2 (asterisks). (C) Sagittal T2-weighted MRI sequence demonstrates complete transection of medulla/upper cervical spinal cord, enlargement of the supradental space (open arrow) and tears in the tectorial membrane and transverse ligament (thin arrow).
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Head computed tomography (CT) showed no obvious abnormality, but cervical CT showed atlanto-occipital dislocation (AOD) and atlanto-axial subluxation (AAS) characterized by widening the atlanto-occipital joint and the distance between C1 and C2 (Fig. 1A,B). Additionally, it suggested tears in the tectorial membrane and transverse ligament, and the enlargement of supradental space (Fig. 1C).