Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size can not be assessed due to adjacent pleural effusion . Large left pleural effusion with compressive atelectasis . The mediastinal and hilar contours are normal . The aorta is calcified , indicating atherosclerosis . No pneumothorax is seen . Known rib fractures and left humeral head fracture are poorly visualized on this single portable AP chest radiograph . The patient is status post right shoulder surgery .
    OUTPUT:
    
Large left pleural effusion with compressive atelectasis .