,%20maxillary%20(B)%20and%20ethmoid%20(C)%20sinuses%20(upper%20left).%20In%20endoscopic%20sinus%20surgery,%20your%20doctor%20uses%20an%20endoscope%20and%20tiny%20cutting%20tools%20to%20open%20the%20blocked%20passage%20and%20restore%20natural%20drainage%20(lower%20right).&title=Nasal%20polyps)
Illustration shows the frontal (A), maxillary (B) and ethmoid (C) sinuses (upper left). In endoscopic sinus surgery, your doctor uses an endoscope and tiny cutting tools to open the blocked passage and restore natural drainage (lower right).
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