Clinical Presentation

A child with fever and cough.

Frontal chest radiograph demonstrates a masslike opacity in the right upper lobe (arrow) with otherwise clear lungs.

Differential Diagnosis

• Round pneumonia: In the clinical setting of acute infection and because primary pulmonary malignancies are so rare in children, a round opacity in a child is most likely to represent a round pneumonia, a diagnosis supported in this case by the presence of air bronchograms in the medial portion of the lesion.