Computerized tomography of the cervical spine confirmed the diagnosis along with occipitalization
and assimilation of the atlas and absent ossifications centers of the upper cervical spine (Figures 2 and 3).
X-ray skull showed multiple wormian bones, widened sutures and patent anterior fontanel and occipitalization
of C1 vertebrae [Figure 3].
If too much material is included in the base of the skull, occipitalization
of the atlas will result.
Cervical vertebral fusions occur in 20 to 35% of cases, whereas platybasia and occipitalization
of the atlas are found in about 30% (6).
For instance, one study showed that 4 out of 5 cases who had occipitalization of the atlas also had an atypical pathway of the VA as it enters the cranium.
The intracranial entrance of the atlantal segment of the vertebral artery in crania with occipitalization of the atlas.
(4) Ugar & Semb studied 611 Norwegian cleft patients and found a frequency of 18.2% of CVA (spina bifida, dehiscence, fusion of vertebrae and occipitalization
INTRODUCTION: Occipitalization of the atlas is defined as congenital bony fusion of the atlas vertebra to the base of the occipital bone of the skull.
DISCUSSION: Occipitalization of atlas results due of failure of segmentation and separation of the most caudal occipital sclerotome and the first cervical sclerotome during the first few weeks of fetal life.
(2003) have reported two cases of occipitalization with spina bifida of atlas.
According to McRae & Barnon (1953), patients with occipitalization of the atlas may have the following physical features like low hairline, torticollis, restricted neck movements and / or abnormal short neck.
(13) Up to 70% of occipitalizations
have been seen associated with C2-C3 fusion with instability at the atlanto-axial articulation.