Pronunciation: og'ston luk
Definition: a rarely used surgical procedure for frontal sinus disease; a skin incision is made from the inner third of the edge of the orbit toward the root of the nose; the periosteum is elevated superiorly and laterally; the sinus is opened; and a wide opening is made by curetting the nasofrontal duct, interior of the frontal sinus, and anterior ethmoid cells.
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Examples: glitazone, GI cocktail, etc.