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Trans-sphenoidal approach. (a,b) Axial CT scan sections of a left PACG. (c) Surgical step: with a diamond bur the sphenoid sinus is opened. (d) Surgical step: with a curve dissection tool the cyst of the PACG is opened and drained. (e) Post-surgery CT scan with regular trans-sphenoidal drainage. cg, cholesterol granuloma.
