A 24-year-old man presents to the emergency department with a tactile fever, cough, and shortness of breath that have persisted for approximately 7 days. The patient notes that his symptoms have worsened in the past 2 days and denies any signs of bleeding, chest pain, or other complaints. He has no significant medical history.

Physical examination reveals normal vital signs except for a temperature of 39.4°C and a pulse of 113 beats per minute. Additional examination was otherwise unremarkable. Laboratory testing revealed a white blood cell (WBC) count of 9.4×109/µL, hemoglobin level of 12.9 g/dL, and platelet count of 344×109/L. His basic metabolic panel was within normal limits.

Initial concerns include bronchitis and pneumonia. A chest radiograph of the patient is obtained (Figure 1).

Figure 1. Chest radiograph of the patient.

What does the image show? What is the next best step in treating this patient?

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