Sinonasal polyposis
Updates to Article Attributes
Sinonasal polyposis refers to the presence of multiple benign polyps in the nasal cavity and paranasal sinuses.
Epidemiology
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
Associations
Conditions known to be associated with polyps such as include 10:
-
infectious rhinosinusitis
, -
cystic fibrosis
, -
allergic fungal sinusitis
, -
asthma
, and - nickel exposure
-
eosinophilic granulomatosis with polyangiitis
10. The sinonasal polyposis can increase the risk of Aspirin Exacerbated Respiratory Disease (AERD).
Clinical presentation
Clinical symptoms of sinonasal polyposis may include progressive nasal obstruction, rhinorrhoea, 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.
Pathology
Polyps are formed by the influx of fluid into the lamina propria of the sinonasal Schneiderian mucosa 8,9.
Grading
The Meltzer grading system is a clinical grading system that is as follows
- grade 0 = no visible polyposis
- grade 1 = single polyp confined to the middle meatus
- grade 2 = multiple polyps in the middle meatus
- grade 3 = extending beyond the middle meatus
- grade 4 = nasal cavity obstruction
Radiographic features
CT
- extensive mucosal polyps occupying and obliterating the nasal cavity and the paranasal sinuses
- usually, they are hypodense but may be hyperdense due to increased protein content or fungal infection
- associated local benign bone remodelling or erosion (as opposed to a mucocele where the entire sinus is expanded 6)
- enlargement of infundibula
- attenuation of the ethmoid sinus walls and nasal septum
- occasionally sparing the inferior nasal meatus
- truncation of middle turbinate 4
- opacified ethmoid sinuses with convex lateral walls and
airgas-fluid levels - a concurrent fungal sinus infection may be present
Complications
Differential diagnosis
-
sinonasal retention cyst
- can be indistinguishable
- usually spares the nasal cavity
-
allergic fungal sinusitis
- commonly associated with polyps
- hyperdense central areas
- MRI may show low T1 and T2 signal
-
granulomatosis with polyangiitis
- centred in the nasal cavity
-<p><strong>Sinonasal polyposis </strong>refers to the presence of multiple benign polyps in the <a href="/articles/nasal-cavity">nasal cavity</a> and <a href="/articles/paranasal-sinuses">paranasal sinuses</a>.</p><h4>Epidemiology</h4><p>It is most commonly encountered in adults and rare in children. Polyps are the most common expansile lesions of the nasal cavity <sup>8</sup>. Incidence increases in patients with conditions known to be associated with polyps such as <a href="/articles/acute-sinusitis">infectious rhinosinusitis</a>, <a href="/articles/cystic-fibrosis">cystic fibrosis</a>, <a href="/articles/allergic-fungal-sinusitis">allergic fungal sinusitis</a>, <a href="/articles/asthma-summary">asthma</a>, and <a href="/articles/asthma-summary">nickel exposure </a><sup>10</sup>. The sinonasal polyposis can increase the risk of Aspirin Exacerbated Respiratory Disease (AERD).</p><h4>Clinical presentation</h4><p>Clinical symptoms may include progressive nasal obstruction, rhinorrhoea, facial pain, headache, <a href="/articles/anosmia">anosmia</a>, etc. <sup>3</sup>. It can also cause a particular <a href="/articles/patterns-of-sinonasal-obstruction">pattern</a> of <a href="/articles/chronic-sinusitis">chronic sinusitis</a> as a result of obstruction of the drainage pathways of the paranasal sinuses.</p><h4>Pathology</h4><p>Polyps are formed by the influx of fluid into the lamina propria of the sinonasal Schneiderian mucosa <sup>8,9</sup>.</p><h5>Grading</h5><p>The <a href="/articles/meltzer-grading-system">Meltzer grading system</a> is a clinical grading system that is as follows </p><ul>- +<p><strong>Sinonasal polyposis </strong>refers to the presence of multiple benign polyps in the <a href="/articles/nasal-cavity">nasal cavity</a> and <a href="/articles/paranasal-sinuses">paranasal sinuses</a>.</p><h4>Epidemiology</h4><p>It is most commonly encountered in adults and rare in children. Polyps are the most common expansile lesions of the nasal cavity <sup>8</sup>.</p><h5>Associations</h5><p>Conditions known to be associated with polyps include <sup>10</sup>:</p><ul>
- +<li><a href="/articles/acute-sinusitis">infectious rhinosinusitis</a></li>
- +<li><a href="/articles/cystic-fibrosis">cystic fibrosis</a></li>
- +<li><a href="/articles/allergic-fungal-sinusitis">allergic fungal sinusitis</a></li>
- +<li><a href="/articles/asthma-summary">asthma</a></li>
- +<li><a href="/articles/asthma-summary">nickel exposure</a></li>
- +<li><a title="Eosinophilic granulomatosis with polyangiitis" href="/articles/eosinophilic-granulomatosis-with-polyangiitis">eosinophilic granulomatosis with polyangiitis</a></li>
- +</ul><h4>Clinical presentation</h4><p>Clinical symptoms of sinonasal polyposis may include progressive nasal obstruction, rhinorrhoea, facial pain, headache, <a href="/articles/anosmia">anosmia</a>, etc. <sup>3</sup>. It can also cause a particular <a href="/articles/patterns-of-sinonasal-obstruction">pattern</a> of <a href="/articles/chronic-sinusitis">chronic sinusitis</a> as a result of obstruction of the drainage pathways of the paranasal sinuses.</p><h4>Pathology</h4><p>Polyps are formed by the influx of fluid into the lamina propria of the sinonasal Schneiderian mucosa <sup>8,9</sup>.</p><h5>Grading</h5><p>The <a href="/articles/meltzer-grading-system">Meltzer grading system</a> is a clinical grading system that is as follows </p><ul>
-<li>opacified ethmoid sinuses with convex lateral walls and air-fluid levels</li>- +<li>opacified ethmoid sinuses with convex lateral walls and gas-fluid levels</li>
-</ul><h4>Complications</h4><ul><li>-<a href="/articles/osseous-metaplasia">osseous metaplasia</a> <sup>11 </sup>-</li></ul><h4>Differential diagnosis</h4><ul>- +</ul><h4>Complications</h4><ul>
- +<li>
- +<a href="/articles/osseous-metaplasia">osseous metaplasia</a> <sup>11</sup>
- +</li>
- +<li><a title="Aspirin-induced asthma" href="/articles/non-steroidal-anti-inflammatory-drug-exacerbated-respiratory-disease">aspirin exacerbated respiratory disease (AERD)</a></li>
- +</ul><h4>Differential diagnosis</h4><ul>
References changed:
- 12. Kshirsagar R, Chou D, Wei J, Liang J. Aspirin-Exacerbated Respiratory Disease: Longitudinal Assessment of a Large Cohort and Implications of Diagnostic Delay. Int Forum Allergy Rhinol. 2020;10(4):465-73. <a href="https://doi.org/10.1002/alr.22516">doi:10.1002/alr.22516</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/32104978">Pubmed</a>
- Kshirsagar R, Chou D, Wei J, Liang J. Aspirin‐exacerbated Respiratory Disease: Longitudinal Assessment of a Large Cohort and Implications of Diagnostic Delay. Int Forum Allergy Rhinol. 2020;10(4):465-73. <a href="https://doi.org/10.1002/alr.22516">doi:10.1002/alr.22516</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/32104978">Pubmed</a>