Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal image of the chest demonstrates low lung volumes which are likely secondary to poor inspiration . There has been interval increase in the left lower lobe opacity . The increase in opacity of the right perihilar region likely represents vascular crowding secondary to low lung volumes . Cardiomediastinal silhouette is slightly more obscured by the increasing left opacity but appears to be unchanged from prior exam . The right central line , defibrillator devices , and NG tube appear to be in unchanged positions .
    OUTPUT:
    
Increasing left lower lobe opacity .