Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are mildly hypoinflated , but there are no focal airspace opacities . There is mild vascular crowding in the hila bilaterally . The cardiomediastinal silhouette , hilar contours and pleural surfaces are otherwise normal . There is no pleural effusion or pneumothorax . There is mild leftward curvature of the partially visualized lumbar spine .
    OUTPUT:
    
1 . Slightly low lung volumes but no evidence of acute cardiopulmonary abnormality . 2 . The heart is not enlarged .