Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Hypoinflated lungs with vascular crowding . Difficult to exclude mild pulmonary edema given low lung volumes . Bibasilar atelectasis with retrocardiac left lower lobe opacity . Top normal heart size . Mediastinal contour and hila are otherwise unremarkable . Limited assessment of the upper abdomen is unremarkable .
    OUTPUT:
    
1 . Given low lung volumes difficult to exclude pulmonary edema . 2 . Bibasilar atelectasis with retrocardiac left lower lobe opacities most consistent with atelectasis however can not exclude superimposed infection in the appropriate clinical setting . No large consolidation .