A 5-year-old boy is brought to the emergency department with a 2-week history of recurrent cough and mild fever. Bronchoscopy reveals a peanut fragment lodged in the left main bronchus. Which finding best distinguishes a chronic foreign body aspiration from acute aspiration in terms of mucosal changes?

Explanation

## Chronic vs. Acute Foreign Body Aspiration: Mucosal Discrimination ### Temporal Evolution of Mucosal Changes **Key Point:** Chronic foreign body aspiration (>2 weeks) triggers an inflammatory response with granulation tissue formation, whereas acute aspiration (<48 hours) shows minimal or no mucosal changes. ### Comparison Table: Acute vs. Chronic FB Aspiration | Feature | Acute FB Aspiration | Chronic FB Aspiration | |---------|--------------------|-----------------------| | **Timeline** | Hours to 48 hours | >2 weeks | | **Mucosal appearance** | Clean, minimal edema | Granulation tissue, friable mucosa | | **Secretions** | Clear or minimal | Mucopurulent, foul-smelling | | **Fever** | Absent | Present (low-grade) | | **Cough** | Acute paroxysmal | Recurrent, persistent | | **Bronchoscopic findings** | FB easily visible, clean | FB embedded, surrounded by granulation | | **Complications** | Asphyxia, acute hypoxia | Bronchial stenosis, bronchiectasis | ### Pathophysiology of Chronic Inflammation **High-Yield:** The foreign body acts as a **chronic irritant**, triggering: 1. Acute inflammatory infiltrate (first 48–72 hours) 2. Granulation tissue formation (by day 7–10) 3. Epithelialization and fibrosis (weeks 2–4) 4. Risk of bronchial stenosis and bronchiectasis if not removed **Mnemonic:** **GRACED** — Granulation, Recurrent infection, Airway edema, Chronic cough, Epithelial damage, Distal complications. ### Clinical Pearl **Clinical Pearl:** A 2-week history of recurrent cough with low-grade fever strongly suggests chronic aspiration. The presence of granulation tissue and mucopurulent secretions on bronchoscopy confirms the chronic inflammatory state and indicates the need for urgent removal to prevent irreversible bronchial damage. ### Diagnostic Significance **Tip:** In chronic cases, gentle bronchoscopic removal is critical because the granulation tissue can bleed profusely and the FB may be partially embedded. Forceful extraction risks perforation of the bronchial wall. [cite:Cummings Otolaryngology 7e Ch 193]