Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable upright chest radiograph demonstrate cardiomegaly . Heart size appears slightly increased compared to prior study , though this may be exaggerated by low lung volumes . Faint bibasilar opacifications may represent combination of atelectasis and portable technique . No opacification concerning for pneumonia . No pleural effusions or pneumothorax evident .
    OUTPUT:
    
No acute cardiopulmoanry process .