Figure 1.

Endoscopic anterior ethmoidectomy (antrostomy) approach. (A) Endoscopic overview of the left nasal cavity and middle meatus; (B) medialization of middle turbinate with better visualization of ethmoid bulla; (C) immediately after completion of uncinectomy and initial expansion of the antrostomy; (D) further enlargement of the antrostomy posteriorly to connect the natural and any accessory ostium of MS; (E) complete removal of bulla; (F) overview of final aspect of maxillary sinus anterior ethmoidectomy