Diffuse widening of the diploic space of the calvarial bones (except the occipital bone) with typical hair on end appearance, more prominent in the frontal bones.
Thickening of facial bones is also noted.
No pneumatisation of the frontal, maxillary, and sphenoid sinuses. Normal pneumatisation of the ethmoid air cells.
No gross abnormality in the brain parenchyma.