| Measure | Mean (SD) (mm) | MDCT Normal Value (mm) |
| Basion-dens interval | 7.3 (0.1) | < 7.5 |
| C2 prevertebral ST | 4.4 (0.4) | < 5.4 |
| Atlanto-dental interval | 2.3 (0.2) | <2.8 |
| Atlanto-occipital interval | 2.4 (0.4) | <3.2 |
| Lateral mass interval | 2.9 (0.5) | <3.9 |
Reference:
Vachhrajani S., et al (2014). “Estimation of normal computed tomography measurements for the upper cervical spine in the pediatric age group.” J Neurosurg Pediatrics 14:425–433.