Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiograph demonstrates low lung volumes . Allowing for this , radiograph appears similar when compared to prior study dated ___ . There is opacification of the left lung base compatible with pleural effusion and atelectasis . The heart is enlarged with mild pulmonary congestion . No pneumothorax is seen .
    OUTPUT:
    
1 . Left lower lobe pleural effusion and opacification thought likely sequela of atelectasis and / or aspiration , though early infectious process can not entirely be excluded . 2 . Enlarged heart with mild congested pulmonary vessels . No overt pulmonary edema .