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Pathology - Benign Sinonasal Diseases
Sinonasal polyps are benign polypoid lesions located in the sinonasal canal. They are typically caused by repeated bouts of infection or allergic rhinitis. • Occurs primarily in adults. Cystic fibrosis may be present in children, accompanied by nasal blockage. Polyps have an oedematous stromal core and sinonasal-type epithelium.
Schneiderean papillomas
• Sinonasal papillary lesions are benign and originate in the sinonasal epithelium. • The exophytic type originates from the nasal septum and consists of papillary fronds covered in bland squamous epithelium. • Endophytic (inverted) type: lobules of transitional/squamous epithelium with many intraepithelial microcysts. • Oncocytic (cylindrical) type: exophytic and endophytic proliferation of columnar oncocytic epithelium with many intraepithelial microcysts. • All types have a risk of local recurrence if incompletely removed. The inverted form carries the highest recurrence risk.
Allergic fungal sinusitis is caused by an allergic reaction to common fungal antigens. Symptoms include nasal itching and discharge. Severe cases can result
Sinonasal polyps are benign polypoid lesions located in the sinonasal canal. They are typically caused by repeated bouts of infection or allergic rhinitis. • Occurs primarily in adults. Cystic fibrosis may be present in children, accompanied by nasal blockage. Polyps have an oedematous stromal core and sinonasal-type epithelium.
Schneiderean papillomas
• Sinonasal papillary lesions are benign and originate in the sinonasal epithelium. • The exophytic type originates from the nasal septum and consists of papillary fronds covered in bland squamous epithelium. • Endophytic (inverted) type: lobules of transitional/squamous epithelium with many intraepithelial microcysts. • Oncocytic (cylindrical) type: exophytic and endophytic proliferation of columnar oncocytic epithelium with many intraepithelial microcysts. • All types have a risk of local recurrence if incompletely removed. The inverted form carries the highest recurrence risk.
Allergic fungal sinusitis is caused by an allergic reaction to common fungal antigens. Symptoms include nasal itching and discharge. Severe cases can result
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