Teenager with cough and fever Pediatric Imaging Chest May 24, 2026February 27, 2026 CXR AP (left) shows dense opacity in the lower left lung that is obscuring the left heart border and causing a silhouette sign. CXR lateral (right) shows a dense triangular opacity anterior over the heart. The diagnosis was bacterial pneumonia in the lingula. Related Published May 24, 2026February 27, 2026