Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 19 :29 is submitted .
    OUTPUT:
    
Heart remains enlarged which may reflect cardiomegaly , although pericardial effusion should also be considered . A dual lead left - sided pacer remains in place with the leads terminating over the expected location of the right atrium and right ventricle , respectively . Lung volumes have diminished with patchy linear opacities at both bases , left greater than right , more likely reflecting atelectasis , although pneumonia or aspiration should also be considered . No pulmonary edema . No pneumothorax .