Abstract
Our study on the anatomical variation of pneumatisation of the sphenoid sinuses was performed on 200 tomographical studies, evaluating the anatomical variations of the sphenoid sinuses and the Onodi cells, the types of pneumatisation according with the types described by Hammer and Radberg, as well as the extensions of pneumatisation towards the anterior clinoid processes, pterygoid processes and sphenoidal wings; the frequency of intrasphenoidal protrusions and dehiscences of internal carotid artery, optic nerve, Vidian canal and foramen rotundum and the presence of primary and secondary septa attached to their canals.