A 22-Month-Old Girl With 3 Weeks of Dyspnea.

A previously healthy 22-month-old girl presented to the ED with a 3-week history of dyspnea on exertion. A chest radiograph showed a right upper-lobe opacity suspicious for pneumonia (Fig 1A). The patient was prescribed amoxicillin but returned to the ED 7 days later with cough and persistent dyspnea and tachypnea. At that time, a repeat chest radiograph was concerning for worsening pneumonia (Fig 1B). Treatment with azithromycin and albuterol was initiated, and amoxicillin was discontinued. Her symptoms briefly improved; however, she returned to the ED 10 days later because of worsening cough and tachypnea, and a 2-day history of increased irritability, decreased oral intake, decreased urine output, and intermittent perioral cyanosis. She was afebrile throughout this period per parent report and vital sign documentation at each ED visit.