Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . The aorta remains tortuous and diffusely calcified . The mediastinal and hilar contours are otherwise unchanged . Pulmonary vasculature is normal . Lungs are clear . No focal consolidation , pleural effusion or pneumothorax is seen . Large amount of free air is noted under the diaphragms . No acute osseous abnormalities demonstrated .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Large amount of pneumoperitoneum , presumably related to peritoneal dialysis .