Fig. 4.

Evolution of an atypical round pneumonia in a 2-year-old with fever and cough. a-b Chest radiograph shows a round opacity in the posterior segment of the right upper lobe. c Follow-up radiograph obtained a few days later demonstrates rapid change. A radiograph obtained several weeks later after antibiotic treatment showed complete resolution (not shown). Note that on the first exam the lesion is in the right upper lobe and surrounded by lung. The clinical presentation and the age of the child suggested round pneumonia as the first possibility. The atypical features prompted the follow-up evaluation