Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiac silhouette is stably enlarged . The mediastinal and hilar contours are similar to the prior examinations . No definite focal consolidation is identified . There is no pleural effusion or pneumothorax . A hiatal hernia is noted .
    OUTPUT:
    
No acute intrathoracic abnormality . Cardiomegaly .