Other than chronic shunting, what are causes of calvarial thickening?
There are many possible etiologies, including Paget disease, fibrous dysplasia, thalassemia. Hyperostosis frontalis interna may cause localized thickening at the front of the skull.
Marked calvarial thickening with parietal bone ventricular shunt. An old shunt track overlying the upper posterior neck can also be seen.