Preschooler with a fever

CXR and CT of subpulmonic pleural effusion and empyema
CXR AP (above) shows a right lower lobe infiltrate and elevation of the right hemidiaphragm and lateralization of its apex. Coronal 2D reconstruction from CT with contrast of the chest (below) shows a loculated fluid collection between the inferior border of the right lung and the right hemidiaphragm.

The diagnosis was a right subpulmonic pleural effusion / pleural empyema.