## Histological Classification of Nasal Polyps **Key Point:** Inflammatory (benign) polyps, also called simple polyps or allergic polyps, are the most common type of nasal polyp, accounting for 90% of all nasal polyps in the general population and in India. ### Characteristics of Inflammatory Polyps - **Histology:** Benign mucosa with edema, chronic inflammation, and intact epithelium - **Origin:** Arise from lateral nasal wall near ostiomeatal complex - **Association:** Strongly linked to chronic rhinosinusitis and allergic rhinitis - **Bilateral:** Often bilateral (60–70% of cases) - **Clinical presentation:** Nasal obstruction, rhinorrhea, post-nasal drip, hyposmia ### Comparison with Other Types | Type | Frequency | Bilaterality | Key Feature | |------|-----------|--------------|-------------| | **Inflammatory (benign)** | 90% | Often bilateral | Edematous mucosa | | **Antrochoanal** | 4–6% | Unilateral | Arises from maxillary sinus, extends into nasopharynx | | **Inverted papilloma** | 0.5–4% | Usually unilateral | Malignant potential (5–15%), intact basement membrane | | **Allergic fungal** | 1–2% | Often unilateral | Associated with fungal colonization, eosinophil-rich | **High-Yield:** Inflammatory polyps are benign, do not have malignant potential, and respond well to medical management (intranasal corticosteroids). Surgical removal is reserved for cases refractory to medical therapy or causing significant obstruction. **Clinical Pearl:** The presence of bilateral nasal polyps should raise suspicion for cystic fibrosis in children; however, in adults, allergic rhinitis and chronic rhinosinusitis are the predominant causes. [cite:Scott-Brown's Otorhinolaryngology 8e Ch 47] 
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