NCIt synonyms : Polyp of the Paranasal Sinus; Polyp of the Accessory Sinus; Accessory Sinus Polyp; Polyp of Paranasal Sinus; Polyp of Accessory Sinus;
NCIt definition : A polyp that arises from the paranasal sinus mucosa. Causes include allergic rhinitis,
chronic sinusitis, and cystic fibrosis. It is characterized by the presence of edematous
tissue infiltrated by inflammatory cells, including eosinophils.;