Endoscopic Endonasal Approach in the Sagital and Coronal planes. Overview of the extradural areas exposed through the endonasal approach to the skull base: sellar and parasellar region, tubercullum sellae, chiasmatic groove, planum sphenoidale, cribiform region, clival region, orbital region, middle fossa and Meckel’s cave. (Image courtesy of JC Fernandez-Miranda)