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600x600
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149k
Artist:
Peter Casano, M.D.
  Frontal Sinus Drainage
2000 Peter Casano, M.D.  
  The frontal sinus has the longest drainage pathway . Surprisingly, the frontal sinus is not as frequently involved as the maxillary or anterior ethmoid sinuses. The frontal sinus outflow is obstructed to a variable degree by the anterior ethmoid cells.
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