Editing Nasal polyp (section)

===Types===
There are two primary types of nasal polyps: ethmoidal and antrochoanal. Ethmoidal polyps arise from the [[ethmoid sinuses]] and extend through the [[middle meatus]] into the nasal cavity. Antrochoanal polyps usually arise in the [[maxillary sinus]] and extend into the nasopharynx and represent only 4–6% of all nasal polyps.<ref name="Peds2016">{{Cite book |last=Haddad |first=Joseph |title=Nelson Textbook of Pediatrics |publisher=Elsevier Health Sciences |year=2016 |isbn=978-1455775668 |pages=2010–2011}}</ref>

However, antrochoanal polyps are more common in children comprising one-third of all polyps in this population. Ethmoidal polyps are usually smaller and multiple while antrochoanal polyps are usually single and larger.<ref name="Peds2016" />