Kewei Zhang, MD; Joshua Broder, MD 0196-0644/$-see front matter Copyright © 2017 by the American College of Emergency Physicians. http://dx.doi.org/10.1016/j.annemergmed.2017.04.003 [Ann Emerg Med. 2017;70:e33-e34.] An 8-year-old boy presented to the emergency department with 6 days of fever, productive cough, and chest pain. The patient had recently arrived in the United States from Iraq and was not immunized. Chest radiograph showed a cavitary lesion with an air-uid level in the left lung (Figures 1 and 2). For the diagnosis and teaching points, see page e34. To view the entire collection of Images in Emergency Medicine, visit www.annemergmed.com Figure 1. Upright posterior-anterior view chest radiograph demonstrating a thick-walled cavitary lesion with an air-uid level in the left lung. Figure 2. Lateral-view chest radiograph conrming a cavitary lung lesion, consistent with abscess. Figure 3. CT with intravenous contrast (axial view, soft tissue window setting) demonstrating a large cavitary lesion with an air-uid level in the left lung. The abscess is enhanced around its perimeter with intravenous contrast. Figure 4. Postoperative posterior-anterior view chest radiograph revealing resolution of the abscess after marsupialization. Figure 5. Lateral view chest radiograph after marsupialization. A cavitary lesion is no longer observable. Volume 70, no. 3 : September 2017 Annals of Emergency Medicine e33 IMAGES IN EMERGENCY MEDICINE