Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right pectoral pacer has leads ending in the right atrium and right ventricle . A left port ends in the low superior vena cava . There is a tracheostomy tube . Left lower lobe linear opacities most likely represent atelectasis . Otherwise , the lungs are clear without focal opacity , pulmonary edema , pleural effusion or pneumothorax . The aortic knob is calcified . The heart size is likely normal .
    OUTPUT:
    
No acute cardiopulmonary process .