Signs of life-threatening neck or upper thoracic injury (look for TWELVE):
Features may include signs and symptoms of:
Spinal cord injury
Vertebral and Carotid Artery Dissection
Laryngeal or tracheal injury
Spinal cord injury
Vertebral and Carotid Artery Dissection
Laryngeal or tracheal injury
In a small study of 42 patients with a cervical seatbelt sign there were no isolated  cerebrovascular injuries. For pediatric patients in a motor vehicle collision, the presence of an isolated seatbelt sign was not associated with any cases of cerebrovascular injury.
Blunt neck trauma
Penetrating neck trauma
Dental avulsion
Vertebral and carotid artery dissection
Head trauma 
Strangulation
Maxillofacial trauma
Whiplash injury