Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided dual - chamber pacemaker appears intact and in unchanged position . The lungs are clear without confluent consolidation . No large pleural effusion is evident . There is no pneumothorax . No pulmonary edema is identified . Increased retrocardiac opacity corresponds with a known large hiatal hernia . A surgical clip is again noted within the left upper quadrant . There is loss of height of multiple thoracic vertebral bodies , though similar in severity compared to prior examination . Mediastinal and hilar contours are within normal limits . Mild cardiomegaly is unchanged .
    OUTPUT:
    
No acute cardiopulmonary process