Clivo-axial angle

The clivo-axial angle (CXA), also known as the clivus canal angle, the clivus vertebral angle, the clivus spinal angle or the clivus cervical angle, indicates the angle between the clivus and the spine. Botelho and Ferreira (2013) define the CXA as"The angle between the line extending from the top of the dorsum sellae to the basion and the line between the inferodorsal portions of C2 to the most superodorsal part of the dens."