Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly and calcification of a mildly tortuous thoracic aorta is unchanged . Hilar contours are unremarkable . Lung volumes are relatively low causing bronchovascular crowding . The lungs are clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality .