The radiographic evaluation of the bony anatomy of the upper cervical spine and foramen magnum region is relatively difficult. The complex bony geometry of this region makes no two-dimensional imaging technique entirely satisfactory. Multiplanar CT reconstruction (MPR) images are commonly used to aide in the interpretation of axial CT studies. The recent development of three-dimensional computer graphics images derived from routine axial CT images (3D-CT) provides a powerful new method for displaying these bony anatomic relationships. This report briefly explains the 3D-CT technique and discusses its advantages in the craniocervical junction region.
