Mt

f nB

Figure 36 Sagittal (a) and endoscopic (b) views after completion of total ethmoidectomy and maxillary antrostomy. The frontal sinus is identified by drawing a line (solid arrow) parallel to the bony nasolacrimal duct (oval) and directed superiorly from the anterior border of the antrostomy or maxillary sinus natural ostium area to a point 5 to 10 mm behind the anterior attachment of the middle turbinate (asterisk). The correct point of entry will be directed superomedially away from the wall of the orbit and anteriorly away from the anterior ethmoid artery (AA). S = sphenoid sinus. PE = area of the posterior ethmoid sinus. B = area of the ethmoid bulla. I = infundibular area. M = maxillary sinus. PA = posterior ethmoid artery.

Figure 36 Sagittal (a) and endoscopic (b) views after completion of total ethmoidectomy and maxillary antrostomy. The frontal sinus is identified by drawing a line (solid arrow) parallel to the bony nasolacrimal duct (oval) and directed superiorly from the anterior border of the antrostomy or maxillary sinus natural ostium area to a point 5 to 10 mm behind the anterior attachment of the middle turbinate (asterisk). The correct point of entry will be directed superomedially away from the wall of the orbit and anteriorly away from the anterior ethmoid artery (AA). S = sphenoid sinus. PE = area of the posterior ethmoid sinus. B = area of the ethmoid bulla. I = infundibular area. M = maxillary sinus. PA = posterior ethmoid artery.

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