Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph demonstrates low lung volumes with increased prominence of the cardiac silhouette and bronchovascular crowding . The heart is top normal in size . There is no focal consolidation , pleural effusion , or pneumothorax . No mediastinal free air is seen . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary process .