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Round pneumonia in a 16-year-old girl with fever and cough. a Frontal and (b) lateral chest radiographs demonstrate a round opacity in the basal segment of the left lower lobe with poorly defined margins (arrowheads). In older children, the margins of the lesions are less sharp because of maturation of the mechanisms of collateral air drift. Follow-up study obtained at 6 weeks revealed complete resolution (not shown)
