A 42-year-old woman from Mumbai presents with a 6-month history of nasal obstruction, recurrent post-nasal drip, and chronic cough. She reports occasional facial pressure and anosmia. Examination shows pale, boggy nasal mucosa with clear rhinorrhea. Nasal endoscopy reveals multiple polypoid masses in both nasal cavities, predominantly in the ostiomeatal complex region. CT paranasal sinuses shows opacification of the maxillary and ethmoid sinuses with polypoid soft tissue densities. She denies fever, facial pain, or purulent discharge. What is the most likely diagnosis?

Explanation

## Clinical Diagnosis This patient has **chronic rhinosinusitis with nasal polyps (CRSwNP)**, characterized by: ### Diagnostic Criteria Met **Key Point:** Diagnosis requires BOTH: 1. **Duration ≥ 12 weeks** of symptoms (this patient: 6 months) 2. **Objective findings** on endoscopy or imaging (polypoid masses, sinus opacification) ### Clinical Features Present | Feature | This Patient | CRSwNP Typical | |---------|--------------|----------------| | Duration | 6 months (≥ 12 weeks) | ≥ 12 weeks | | Nasal obstruction | ✓ | ✓ (cardinal symptom) | | Post-nasal drip | ✓ | ✓ | | Anosmia | ✓ | ✓ (polyps obstruct olfactory cleft) | | Facial pain | ✗ (absent) | Often absent in CRS | | Fever/purulent discharge | ✗ (absent) | Absent (chronic, not acute) | | Pale, boggy mucosa | ✓ | ✓ (chronic edema) | | Polypoid masses | ✓ (bilateral, ostiomeatal complex) | ✓ | | CT: opacification + polyps | ✓ | ✓ | ## Pathophysiology ```mermaid flowchart TD A[Chronic mucosal inflammation]:::outcome --> B[Impaired mucociliary clearance]:::action B --> C[Persistent eosinophilic infiltration]:::action C --> D[Epithelial remodeling]:::action D --> E[Polyp formation]:::outcome A --> F[Ostiomeatal complex obstruction]:::action F --> G[Sinus ventilation impairment]:::action G --> H[Secondary bacterial colonization]:::action H --> I[Chronic inflammation perpetuated]:::outcome ``` ## Differential Diagnosis | Diagnosis | Duration | Presentation | Endoscopy | CT Findings | Key Distinguisher | |-----------|----------|--------------|-----------|-------------|-------------------| | **CRSwNP** | ≥ 12 weeks | Obstruction, anosmia, post-nasal drip | Bilateral polypoid masses | Opacification + polyps | Chronic, bilateral, pale polyps | | Acute ABRS | < 4 weeks | Purulent discharge, facial pain, fever | Edema, pus in middle meatus | Air-fluid levels, acute edema | Acute onset, purulent, fever | | AFS | Variable | Thick, ropy discharge; proptosis if orbital | Fungal debris, polyps | Hyperdense material, bone erosion | Fungal hyphae on culture; immunocompromised | | Antrochoanal polyp | Variable | Unilateral obstruction, post-nasal mass | Single polyp extending into nasopharynx | Single polyp from maxillary sinus | Unilateral, single stalk from maxillary sinus | **High-Yield:** CRSwNP is **bilateral**, **pale/boggy**, and **chronic**. Antrochoanal polyps are **unilateral** and arise from a **single stalk** in the maxillary sinus. ## Management Approach ```mermaid flowchart TD A[CRSwNP Confirmed]:::outcome --> B[First-line: Medical Therapy]:::action B --> C[Intranasal corticosteroid spray]:::action C --> D[Saline irrigation]:::action D --> E[Oral corticosteroid course if severe]:::action E --> F{Response in 4-6 weeks?}:::decision F -->|Yes| G[Continue medical management]:::action F -->|No| H[Consider FESS + polypectomy]:::action H --> I[Endoscopic sinus surgery]:::action I --> J[Postoperative topical steroids]:::action ``` **Clinical Pearl:** CRSwNP is often associated with **asthma** (up to 50% of patients), **aspirin sensitivity**, and **eosinophilic granulomatosis with polyangiitis (EGPA)**. Screen for these comorbidities. **Mnemonic for CRS red flags:** **FACE** = **F**ungal (AFS), **A**llergic (IgE-mediated), **C**ystic fibrosis, **E**GPA (formerly Churg-Strauss) [cite:Fokkens et al. EPOS 2020 Guidelines on Rhinosinusitis; Bhattacharyya et al. AAO-HNS Clinical Practice Guideline]