Step-by-step approach to the suprasellar region. The bone of the planum sphenoidale has been removed. Note the bone that forms the roof of the optic canal and its relation with the limbus of the sphenoid dural fold. When treating tuberculum sella meningiomas, it is very important to remove this bone up to the roof of the optic canal to provide enough lateral access for safe tumor removal. (Image courtesy of JC Fernandez-Miranda)