Sinonasal polyposis refers to the presence of multiple benign polyps in the nasal cavity and paranasal sinuses.

It is most commonly encountered in adults and rare in children. Polyps are the most common expansile lesions of the nasal cavity 8. Incidence increases in patients with conditions known to be associated with polyps such as infectious rhinosinusitiscystic fibrosis, aspirin sensitivity and allergic fungal sinusitis.

Clinical symptoms may include progressive nasal obstruction, rhinorrhea, facial pain, headache, anosmia, etc 3. It can also cause a particular pattern of chronic sinusitis as a result of obstruction of the drainage pathways of the paranasal sinuses.

Polyps are formed by the influx of fluid into the lamina propria of the sinonasal Schneiderian mucosa 8,9.

  • extensive mucosal polyps occupying and obliterating the nasal cavity and the paranasal sinuses
    • usually, they are hypodense, but may be hyperdense due increased protein content or fungal infection
  • associated local benign bone remodelling or erosion (as opposed to a mucocoele where the entire sinus is expanded 6)
    • enlargement of infundibula
    • attenuation of the ethmoid sinus walls and nasal septum
    • occasionally sparing of the inferior nasal meatus
    • truncation of middle turbinate 4
  • opacified ethmoid sinuses with convex lateral walls and air-fluid levels
  • a concurrent fungal sinus infection may be present
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Article information

rID: 31864
System: Head & Neck
Synonyms or Alternate Spellings:

Cases and figures

  • Sinonasal polypos...
    Case 1
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  • Case 2: with secondary fungal infection
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  • Case 3
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  • Case 4
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  • Case 5
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  • Case 6: MRI
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