Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Both lungs are well expanded and clear . There are no lung opacities concerning for pneumonia or pulmonary edema . The heart size is normal . The thoracic aorta is tortuous and shows mild - to - moderate calcification . The hilar contours are unremarkable . The right lateral and posterior costophrenic angle is blunted , unchanged since ___ and could be effusion or chronic pleural thickening . The left pleural space is normal .
    OUTPUT:
    
No pneumonia . Clear lungs .