Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable view of the chest demonstrates low lung volumes . Left lung opacities are new since prior . There is relative sparing of the left upper lung . No pleural effusion is seen . No pneumothorax . Hilar and mediastinal silhouettes are unchanged . Heart size is top normal . Post - surgical changes related to median sternotomy and CABG are stable .
    OUTPUT:
    
Left lung opacities new since ___ , most likely aspiration given rapid developmemt of these findings .