Pappu 2 yrs old boy presents in the causality with H/O sudden onset of respiratory difficulty & stridor on auscultation, ↓ed breath sound & wheeze on the RT side. The X-ray shows RT opaque hemithorax. What will be diagnosis –
**Core Concept**
A 2-year-old boy presents with sudden onset respiratory distress, stridor, decreased breath sounds, and wheezing on one side, along with radiographic evidence of an opaque hemithorax. This clinical presentation suggests a condition that involves airway obstruction and possible lung collapse.
**Why the Correct Answer is Right**
The boy's symptoms are indicative of a foreign body aspiration, which is a common cause of acute respiratory distress in toddlers. The sudden onset of respiratory difficulty and stridor suggests an obstruction in the upper airway, while the decreased breath sounds and wheezing on one side indicate lung collapse or atelectasis. The radiographic evidence of an opaque hemithorax further supports this diagnosis, as it indicates lung collapse or consolidation.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the clinical presentation described.
* **Option B:** While pneumonia can cause respiratory distress and decreased breath sounds, it typically does not present with sudden onset stridor or an opaque hemithorax on X-ray.
* **Option C:** Bronchiolitis is a common cause of respiratory illness in young children, but it typically presents with a more gradual onset of symptoms and does not usually cause stridor or an opaque hemithorax.
**Clinical Pearl / High-Yield Fact**
In pediatric patients, sudden onset respiratory distress and stridor are highly suggestive of foreign body aspiration. A high index of suspicion and prompt imaging studies are essential in diagnosing this condition.
**Correct Answer: D. Foreign body aspiration.