Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiac , mediastinal and hilar contours are unchanged , with mild enlargement of cardiac silhouette noted . Crowding of the bronchovascular structures is present as a result of the low lung volumes , with possible mild pulmonary vascular congestion , but no overt pulmonary edema . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with possible mild pulmonary vascular congestion .