Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Increased opacity in the left lung is noted , potentially due to atelectasis given slightly lower lung volume on the left compared to the right . Layering effusion or infection would also be possible . There is no visualized pneumothorax . Left - sided catheter projects over the left mid to upper lung . Cardiac silhouette is moderately enlarged . Atherosclerotic calcifications seen at the aortic arch .
    OUTPUT:
    
Catheter projects over the left mid to upper lung . No visualized pneumothorax . Increased opacity on the left hemi thorax , potentially a combination of atelectasis , layering effusion or possible infection .