C-spine injury uncommon in children but large head in age <8 creates system for upper<unk> Injuries most feared include atlanto-occipital dissociation (AOD) and atlantoaxial rotatory subluxation or fixation (AARF).
Spinal cord injury without radiographic abnormality
Exam findings of myelopathy without abnormalities on XR or CT
Cervical injury 
Cervical fractures and dislocations
Maxillofacial trauma
Atlanto-occipital dissociation
Head trauma 
C1
Blast injury
Jefferson fracture