Calvarial thickening can occur from a number of causes. These include:
- idiopathic
- chronic ventricular shunting 1
- antiepileptic medication
- phenytoin 3
- osteopetrosis 2
- fibrous dysplasia
- acromegaly
- anaemias (largely associated with massive haematopoiesis)
- Paget disease
- hyperparathyroidism
- certain sclerosing bone dysplasias
- cerebral arteriovenous malformations 4: rare
- Dyke-Davidoff-Masson syndrome
- Proteus syndrome