A 38-year-old man from Delhi presents with a 3-year history of progressive nasal obstruction, rhinorrhea, and post-nasal drip. He reports recurrent sinusitis requiring multiple courses of antibiotics. On nasal endoscopy, bilateral smooth, pale, glistening masses are seen arising from the lateral nasal wall near the ostiomeatal complex. CT PNS shows lobulated soft tissue densities in both nasal cavities with widening of the maxillary ostia. He has no history of asthma or aspirin sensitivity. What is the most likely diagnosis?

Explanation

## Diagnosis: Chronic Rhinosinusitis with Nasal Polyposis ### Clinical Presentation The patient presents with the classic triad of nasal polyposis: 1. **Bilateral nasal masses** — smooth, pale, glistening appearance 2. **Arising from ostiomeatal complex** — typical location 3. **Recurrent sinusitis** — indicates underlying chronic rhinosinusitis **Key Point:** Bilateral nasal polyps in an adult without asthma or aspirin sensitivity are most commonly associated with chronic rhinosinusitis with nasal polyposis (CRSwNP), a type 2 inflammatory condition. ### Pathophysiology ```mermaid flowchart TD A[Chronic mucosal inflammation]:::outcome --> B[Eosinophilic infiltration & Th2 response]:::outcome B --> C[Increased IL-4, IL-5, IL-13 production]:::outcome C --> D[Epithelial disruption & edema]:::outcome D --> E[Polyp formation]:::outcome E --> F[Ostial obstruction]:::outcome F --> G[Recurrent sinusitis]:::outcome ``` ### Distinguishing Features | Feature | CRSwNP | Antrochoanal | Inverted Papilloma | |---------|--------|--------------|--------------------| | **Laterality** | Bilateral (80%) | Unilateral | Usually unilateral | | **Origin** | Lateral wall/ostiomeatal | Maxillary sinus floor | Lateral nasal wall/maxilla | | **Appearance** | Smooth, pale, glistening | Smooth, single stalk | Bumpy, cerebriform, friable | | **Malignant potential** | None | None | 5–15% SCC risk | | **Age** | 20–60 years | Younger (10–30) | Older (40–70) | **High-Yield:** The **ostiomeatal complex origin** and **bilateral presentation** are pathognomonic for CRSwNP. ### Investigation Findings - **CT PNS:** Lobulated soft tissue, widened ostia, sinus opacification - **Nasal endoscopy:** Pale, smooth, gelatinous masses; no stalk - **Histology:** Eosinophil-rich infiltrate, intact epithelium (unlike inverted papilloma) ### Management **Mnemonic: STEP** - **S**aline irrigation - **T**opical corticosteroids (first-line) - **E**ndoscopic sinus surgery (if medical failure) - **P**ostoperative surveillance (high recurrence rate: 15–30%) **Clinical Pearl:** Absence of asthma and aspirin sensitivity does not exclude CRSwNP; these are associated factors, not diagnostic criteria. The bilateral location and ostiomeatal origin are diagnostic. [cite:Scott-Brown's Otorhinolaryngology Ch 27]