A 4-year-old girl was brought to our hospital by her parents because of abdominal pain. She hadsuffered minor trauma after rolling from her standard-height bed 2 days prior. Vital signs wereappropriate for age. Physical examination was remarkable for decreased breath sounds to the left sideof the chest. A chest radiograph (Figure) demonstrated a large gas-filled structure in the left side of thechest with mediastinal shift. [West J Emerg Med. 2012;13(1):117–118.]