Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . A linear opacity across the left lower lobe represents linear atelectasis . No other focal opacities are observed . There is mild cardiomegaly , stable . The aorta is tortuous with diffuse atherosclerotic calcifications . There is no pleural effusion or pneumothorax . Sternotomy wires are intact . Prosthetic aortic valve is re-identified . Left proximal humeral deformity is again seen .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .