A 38-year-old man presents with bilateral nasal obstruction and rhinorrhea for 6 months. Nasal endoscopy reveals multiple pale, gelatinous masses arising from the lateral nasal wall. Which of the following is NOT a characteristic feature of benign nasal polyps?

## Characteristics of Benign Nasal Polyps ### Correct Answer: Unilateral Presentation **Key Point:** Benign nasal polyps are classically BILATERAL in presentation, not unilateral. This is a hallmark distinguishing feature from other nasal masses. ### Features of Benign Nasal Polyps | Feature | Detail | |---------|--------| | **Laterality** | Bilateral (80–90% of cases) | | **Epithelium** | Non-keratinized squamous epithelium | | **Origin** | Lateral nasal wall, near ostiomeatal complex | | **Appearance** | Pale, gelatinous, grape-like masses | | **Symptoms** | Nasal obstruction, rhinorrhea, post-nasal drip | | **Pain/Bleeding** | Painless; no spontaneous epistaxis | | **Growth** | Slow, progressive | ### High-Yield Mnemonic: **BILAT-NAP** **B** — Bilateral **I** — Inflammatory origin **L** — Lateral nasal wall (ostiomeatal complex) **A** — Antrochoanal (variant: unilateral, arises from maxillary sinus) **T** — Translucent, gelatinous **N** — Non-keratinized epithelium **A** — Asymptomatic (painless) **P** — Polyp (benign) ### Clinical Pearl **Unilateral nasal mass should raise suspicion for:** - Antrochoanal polyp (variant of benign polyp, but arises from maxillary sinus and extends into nasopharynx) - Malignancy (squamous cell carcinoma, adenocarcinoma, lymphoma) - Inverted papilloma (precancerous, unilateral, bleeding, bone erosion) - Hemangioma or other benign tumors **Warning:** A patient presenting with a unilateral nasal mass MUST be evaluated with imaging (CT/MRI) and biopsy to exclude malignancy. Benign polyps are bilateral unless they are the antrochoanal variant. ### Pathophysiology Benign nasal polyps arise from chronic inflammation of the nasal mucosa, likely triggered by: - Allergic rhinitis - Chronic rhinosinusitis - Aspirin sensitivity (in Samter's triad) - Genetic predisposition (cystic fibrosis, primary ciliary dyskinesia) The polyps are composed of edematous, loose connective tissue covered by non-keratinized squamous epithelium, accounting for their pale, translucent appearance. [cite:Scott-Brown's Otorhinolaryngology Ch 5]