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Anatomic dissection showing the periorbit (PO) after complete spheno-ethmoidectomy with the exposure of the Skull base from the I fovea ethmoidalis, anterior ethmoidal artery (AEA), Posterior ethmoidal artery (PEA); to the sphenoid sinus and the following structures: Optic nerve (ON), Interoptic carotid recess and sellar floor Sphenoid Sinus (SS).
