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Dural opening: The dura is with two incisions in the dura, parallel to each other, immediately superior and inferior to the superior intercavernous sinus. The superior intercavernous sinus is coagulated with bipolar forceps and is divided under direct vision to obtain access to the suprasellar cistern. The dural edges are coagulated and shrunk or excised to widen the dural opening. T = tumor, OC = optic chiasm
