Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Rotated positioning . There are low inspiratory volumes . The cardiomediastinal silhouette is prominent , but unchanged . Again seen is increased retrocardiac density and obscuration of the left hemidiaphragm , consistent with left lower lobe collapse and / or consolidation . Equivocal small effusion . There is patchy opacity at the right base , similar to the prior film . No gross right effusion . Upper zone redistribution and mild vascular plethora , minimally improved .
    OUTPUT:
    
1 . Slight improvement in CHF findings . 2 . Left lower lobe collapse and / or consolidation , similar to prior . The possibility of a left lower lobe pneumonic infiltrate can not be excluded . 3 . Patchy opacity right cardiophrenic region , similar to prior . This most likely represents atelectasis , but the possibility of an early infiltrate can not be entirely excluded .