A review and commentary on congenital anomalies of the craniocervical junction.

This brief review focuses on the imaging of the craniocervical junction with particular attention to linear and angular craniometry. It attempts to answer the question of why there are so many measurements and how they are clinically useful. Congenital anomalies of the craniocervical junction will be discussed with an overview of craniocervical junction embryology and development. Entities affecting the craniocervical junction which will be discussed include platybasia, basilar invagination, atlanto-occipital assimilation, and assorted congenital anomalies.