Stopping the Bleeding

Question:  A patient has failed multiple noninvasive approaches to epistaxis management and is referred to you for consideration of arterial ligation.  What is the surgical landmark near the posterior wall of the maxillary sinus that aids in identifying the location of the sphenopalatine artery during endoscopic ligation?   [Answer will be posted with next week's new question]

Answer to last week's question, Make a Splash! (July 27, 2015): 

Yes! The "Clinical Practice Guidelines: Tympanostomy Tubes in Children," published by Rosenfeld et al in 2013 recommends against the routine recommendation for water precautions in all children undergoing ear tube placement.