Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable semi upright frontal chest radiograph demonstrates persistently hypoinflated lungs with vascular crowding and right lower lobe atelectasis . No pneumothorax . No right pleural effusion . Interval increase in small to moderate left pleural effusion with retrocardiac opacity . New heterogeneous opacity projecting over the left mid hemi thorax . Persistent mild cardiomegaly which is partially obscured by left pleural effusion . Aortic arch calcifications noted . Mediastinal contour and hila are otherwise unremarkable . Chronic deformity of the left clavicle again noted .
    OUTPUT:
    
1 . Interval increase in small to moderate left pleural effusion with retrocardiac opacity likely representing a combination of atelectasis and pleural effusion however can not exclude superimposed pneumonia in the appropriate clinical setting . 2 . Heterogeneous opacity projecting over the left mid hemi thorax is most likely a combination of atelectasis and vascular crowding .