Atlanto-occipital assimilation with basilar invagination


Fusion of atlas with occipital bone, superior migration of dens of C2, projecting above foramen of magnum and causing compression and kinking at the cervicomedullary junction in keeping with complete atlanto-occipital assimilation with basilar invagination.

Intramedullary hyperintensity in the cord at C2-3 level in keeping with compressive myelopathy.

The above findings explain the patient's symptoms of neck pain, tingling and numbness in the upper limbs.