Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is borderline prominent . The mediastinal silhouette is unchanged since prior examination . Again noted is a left - sided dual lead pacemaker . The interstitium is prominent , similar to prior examination , and consistent with chronic disease . The difference between the current and previous study likely reflects the AP technique . No pleural effusion is noted . There is no pneumothorax .
    OUTPUT:
    
No acute intrathoracic abnormality .