Platybasia
Platybasia is a spinal disease of a malformed relationship between the occipital bone and cervical spine.
It may be caused by Pagets disease. Platybasia is also a feature of Gorlin-Goltz syndrome, commonly known as basal cell nevus syndrome.
It may be developmental in origin or due to softening of the skull base bone, allowing it to be pushed upward. The developmental variant is the result of a wider angle between the skull base of the frontal or anterior fossa and the clivus, which defines the anterior wall of the posterior fossa. It is sometimes associated with other congenital abnormalities of the bone structure, such as fusion of the first cervical vertebrae to the skull atlas assimilation.

Further reading
Pearce JM (2007). "Platybasia and basilar invagination". Eur. Neurol. 58 (1): 62–4. doi:10.1159/000102172. PMID 17483591.


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