A 2-month-old boy was referred to our surgical department with complaint of an episode of choking and persistent cough. He had otherwise been healthy. He was in good general condition, without fever or respiratory distress. He had a normal heart rate, a respiratory rate of 34 breaths/min, and a percutaneous oxygen saturation greater than 95%. During a chest examination, decreased breath sounds were noted on the lower right hemithorax. A chest radiograph was obtained (Figure).