School ager with cough and shortness of breath Pediatric Imaging Chest July 5, 2026April 17, 2026 CXR PA (left) shows dense opacity throughout the right middle lobe which is obscuring the right heart border (silhouette sign). CXR lateral (right) shows the opacity located over the heart. The diagnosis was right middle lobe bacterial pneumonia. Related Published July 5, 2026April 17, 2026