Ear Nose Throat J. 2007 Jun;86(6):322, 325
FIRST PARAGRAPH: Sinonasal polyps are caused by a multitude of factors. The most common causes are repeated bouts of sinusitis, allergy, vasomotor rhinitis, infectious rhinosinusitis, and asthma. Less often, they occur in association with diabetes mellitus, cystic fibrosis, and aspirin intolerance. They form as a result of an influx of fluids into the schneiderian mucosal lamina propria. Occasionally, antral (maxillary) polyps expand and prolapse through sinus ostia to present intranasally or in the nasopharynx (antrochoanal polyps). Sinonasal polyps have no predisposition to age or sex. Polyps are uncommon in children, but when they do occur, as many as 30% are associated with cystic fibrosis.
PubMed ID: 17703805
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