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Synthesis of PGD2, a product nearly exclusively of MCs, can be controlled with aspirin, histamine increase by H1 and H2 receptor blockade, and LTC4 by a 5-LO inhibitor or LT receptor antagonist. Although other sources are reported, the increase in MC numbers in SM supports this cell as the predominant origin of all three mediators. Chronic rhinosinusitis, historically, has been considered to be caused by upper airway anatomical abnormalities. However, today that concept has changed, for it is now recognized as an inflammatory disorder o