Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiac silhouette is borderline enlarged , likely exaggerated due to AP technique . The mediastinal silhouette is stable the prior examination The aorta is unfolded . The lungs are grossly clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute abnormality .