## Most Common Type of Nasal Polyp **Key Point:** Chronic rhinosinusitis with nasal polyposis (CRSwNP) is the most common type of nasal polyp, accounting for approximately 90% of all nasal polyps in the general population. ### Clinical Features of CRSwNP | Feature | CRSwNP | |---------|--------| | **Presentation** | Bilateral, multiple polyps | | **Site of origin** | Lateral nasal wall, ethmoid sinuses | | **Appearance** | Smooth, pale, gelatinous, translucent | | **Associated symptoms** | Nasal obstruction, rhinorrhea, hyposmia, post-nasal drip | | **Age of onset** | 30–50 years | | **Associations** | Allergic rhinitis, asthma, NSAID sensitivity (ASA triad) | ### Pathophysiology 1. Chronic inflammation of sinonasal mucosa 2. Eosinophilic infiltration and edema 3. Breakdown of epithelial barrier 4. Accumulation of fluid → polyp formation 5. Bilateral and recurrent nature due to underlying mucosal disease **High-Yield:** The presence of **bilateral polyps** is a key clinical clue pointing to CRSwNP rather than other benign polyps. **Clinical Pearl:** Patients with CRSwNP often have a triad of asthma, chronic rhinosinusitis with polyps, and NSAID sensitivity (Samter's triad or ASA triad). These patients require careful NSAID avoidance. ### Why CRSwNP is Most Common - Prevalence: ~90% of all nasal polyps - Results from chronic inflammatory remodeling - Associated with allergic rhinitis in ~50% of cases - More frequent in middle-aged and older adults - Bilateral presentation is characteristic **Mnemonic:** **CHEAP** polyps = **C**hronic rhinosinusitis with nasal polyposis is most **C**ommon, **H**as eosinophilic infiltration, **E**thmoid origin, **A**llergic association, **P**ale appearance. [cite:Scott-Brown's Otolaryngology Ch 5]
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