School ager with systemic lupus erythematosis with new left pleuritic chest pain Pediatric Imaging Chest February 27, 2026February 5, 2026 CXR AP (left) shows a fine interstitial infiltrate in the left lower lung that on the lateral CXR (right) is seen to be projecting over the spine. The diagnosis was left lower lobe acute pneumonitis due to systemic lupus erythematosus. Related Published February 27, 2026February 5, 2026