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).

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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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