School ager with a cough after bone marrow transplant

CXR and CT of invasive aspergillosis
CXR AP and lateral (above) shows a round opacity on the lateral view posteriorly projecting over a mid-thoracic vertebral body. Axial CT without contrast of the chest shows a cavitary lesion in the superior segment of the right lower lobe that has a halo sign peripherally with the parenchymal density surrounded by an irregular ground glass density and an air crescent sign with an area of central necrosis detached from the wall of the lesion.

The diagnosis was invasive aspergillosis.