School ager with fever and cough for 1 week Pediatric Imaging Chest June 29, 2026April 17, 2026 CXR PA (left) shows an opacity in the lingula that is obscuring the left heart border (silhouette sign) which on the CXR lateral (right) is seen to be projecting over the heart. The diagnosis was lingular bacterial pneumonia. Related Published June 29, 2026April 17, 2026