Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval development of airspace opacity in the left lower lobe with silhouetting of the left hemidiaphragm , new since ___ . There is ill - defined opacity in the right lower lobe . The cardiac silhouette is compared well . No interstitial edema . There is blunting of the left costophrenic likely small effusion .
    OUTPUT:
    
New left lower lobe airspace opacities , left greater than right can be aspiration or pneumonia in this clinical setting .