Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . Prominence of the left main pulmonary artery is noted which may be accounted for by patient positioning . A small calcification may be present in the left hilum . The mediastinal and hilar contours are otherwise unremarkable . There is no pleural effusion or pneumothorax . The lungs are well expanded and clear without focal consolidation concerning for pneumonia . Degenerative changes are present throughout the thoracic spine . The upper abdomen is unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .