Vertical fracture line through<unk> <unk>  seen on lateral x-ray
CT test of choice to evaluate for associated fractures
MRI can evaluate ligamentous injury (transverse ligament is primary AA junction stabilizer)
C1 isolated posterior arch fracture
Penetrating neck trauma
C1 isolated anterior arch fracture
Blunt neck trauma
Flexion cervical teardrop fracture
Vertebral and carotid artery dissection
Anterior cervical wedge fracture
Strangulation