Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP semi-upright and lateral views of the chest were obtained . Redemonstrated is mild - to - moderate cardiomegaly with stable appearance of the cardiomediastinal silhouette . A single lead pacemaker is unchanged in position . Lung volumes are low . Lungs are clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Stable cardiomegaly and persistently low lung volumes .