Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal lateral chest radiographs demonstrate low lung volumes , with resultant prominence of the cardiac silhouette and bronchovascular crowding . Allowing for this , heart size is likely normal . There is mild pulmonary edema and vascular congestion . Superimposed on this is increased opacity in the left lung base , which likely represents atelectasis , but an early pneumonia can not be excluded . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Left lower lobe opacity likely represents atelectasis , but an early pneumonia can not be excluded . 2 . Mild pulmonary edema and vascular congestion .