A 2-year-old boy is brought to the ENT clinic with a 1-week history of chronic cough and recurrent respiratory tract infections. Rigid bronchoscopy reveals a foreign body in the left main bronchus. Which of the following is the most common type of foreign body aspirated in the pediatric population?

Explanation

## Most Common Type of Foreign Body in Pediatric Airway Aspiration **Key Point:** Peanuts and other nuts are the most common type of foreign body aspirated in children, accounting for 40–50% of all cases. This is particularly true in India and other developing nations where peanuts are a common snack. ### Why Nuts Are the Most Common FB 1. **Accessibility** — Nuts are readily available, commonly given as snacks to children, and easy to aspirate. 2. **Size and shape** — Peanuts are small enough to pass through the vocal cords but large enough to lodge in the main bronchi. 3. **Radiolucency** — Nuts are radiolucent (not visible on plain X-ray), making them easy to miss on initial imaging — a key diagnostic challenge. 4. **Hygroscopic nature** — Nuts absorb moisture and swell, increasing airway obstruction over time. 5. **Inflammatory response** — Nuts trigger a strong inflammatory response in the airway, causing mucosal edema and granulation tissue formation, which can lead to chronic symptoms. ### Comparison of Common FB Types | FB Type | Frequency | Radiopacity | Key Feature | | --- | --- | --- | --- | | **Nuts (peanuts, almonds)** | 40–50% | Radiolucent | Inflammatory response; swelling | | **Plastic toys/beads** | 20–30% | Radiolucent | Often multiple; visual on bronchoscopy | | **Metallic objects** | 15–20% | Radiopaque | Visible on X-ray; easier to diagnose | | **Food boluses** | 10–15% | Variable | Often dissolve; less common | **Clinical Pearl:** A child with chronic cough, recurrent infections, and a radiolucent FB on bronchoscopy should raise suspicion for a nut aspiration. The absence of a visible FB on X-ray does NOT rule out aspiration — clinical suspicion and bronchoscopy are essential. **High-Yield:** Peanut aspiration is the **single most common cause** of preventable childhood mortality from FB aspiration in developing countries. Prevention (keeping nuts away from young children) is crucial. ### Clinical Presentation Timeline - **Acute phase (0–24 hours):** Coughing, choking, stridor, respiratory distress. - **Silent/latent phase (days to weeks):** Minimal symptoms; child appears well but has chronic cough. - **Chronic phase (weeks to months):** Recurrent respiratory infections, bronchiectasis, granulation tissue formation. **Mnemonic:** **NUTS** = **N**ot visible on X-ray, **U**sually lodge in right bronchus, **T**rigger inflammatory response, **S**mall and commonly aspirated. [cite:Park 26e Ch 10; Robbins & Cotran 10e Ch 15]