Sphenoid Sinus Polyp

**Semantic type:** Disease or Syndrome

**Definition:** A polyp that arises from the sphenoid sinus mucosa. It is characterized by the presence of edematous tissue infiltrated by inflammatory cells, including eosinophils. Causes include allergic rhinitis, chronic sinusitis, and cystic fibrosis.

**Synonyms:** - Polyp of Sphenoid Sinus - Polyp of Sphenoidal Sinus - Polyp of the Sphenoid Sinus - Polyp of the Sphenoidal Sinus - Sphenoidal Sinus Polyp