Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate slightly decreased lung volumes , resulting in prominence of the cardiac silhouette and bronchovascular crowding . There is no focal consolidation , pleural effusion , or pneumothorax . No pneumomediastinum is appreciated . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
No evidence of pneumomediastinum .