Pediatrics Lateral X-ray of the upper airway in a 2-year-old boy reveals a “thumb sign”. The most likely diagnosis is: A Laryngeal polyps B Epiglottitis C Subglottic hemangioma D Laryngeal edema 💡 Explanation Lateral X-ray of the upper airway in a 2-year-old boy reveals a "thumb sign". The most likely diagnosis is: ✓ Correct Answer: B. Epiglottitis