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600x600
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149k
Artist:
Peter Casano, M.D.
  Posterior Sinus Flow Paths 2
2000 Peter Casano, M.D.  
 Since the posterior ethmoids have an independent drainage route, they are not always involved with the obstructions seen in the anterior ethmoid, frontal, and maxillary sinuses. Disease processes that involve all of the sinuses more likely represent an underlying mucosal inflammatory process.
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