Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded except for some mild streaky opacities at the lung bases , possibly areas of chronic atelectasis or scarring . No focal airspace opacity concerning for pneumonia is detected . The heart is not enlarged . The mediastinum and hilar contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of acute cardiopulmonary abnormality .