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a and 1b: Axial CT scan of patient 1 showing necrotic lung mass.
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A 76-year-old male with a past medical history of chronic obstructive pulmonary disease and atrial fibrillation presented for necrotic left lower lung mass (Fig. 1).
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a and 2b: Axial CT scan of patient 2 showing cavitary pneumonia.
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A 63-year-old male with a past medical history of hypertension and diabetes initially presented to our southern California pulmonary clinic for evaluation of a right lung cavitary pneumonia presumed secondary to extended-spectrum beta-lactamase (ESBL) Escherichia coli susceptible to trimethoprim/sulfamethoxazole (Fig. 2).