Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiograph is compared to prior radiograph dated ___ . Relative to prior study , there is improved aeration of bilateral lungs . Patchy parenchymal consolidation seen on previous studies are resolved . Linear opacity projecting over the left lower lung zone likely atelectasis . No focal opacity convincing for pneumonia is identified . There is no pleural effusion or pneumothorax . Visualized osseous structures are without an acute abnormality . Cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Patchy opacity within the left upper lung zone may reflect interval resolution of prior bilateral parenchymal consolidations . However since there were no subsequent chest radiographs , it could be new pneumonia .