Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is subdiaphragmatic free air underlying the left hemidiaphragm . Otherwise the lungs are well - expanded . There is interval increase in coarse interstitial markings . A tiny patchy opacity in the left lower lung , adjacent to the left cardiac margin is present . There is no pleural effusion . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Intra-abdominal free air . 2 . Interstitial pulmonary edema . Small patchy opacity in the left lower lung may represent aspiration versus consolidation .