Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Median sternotomy wires are again seen . The cardiomediastinal and hilar contours are stable , with surgical clips overlying the left heart border . Opacity at the left lung base is chronic and may represent pleural thickening with a small effusion . There is no pneumothorax . The lungs are well expanded without focal consolidation . Mild pulmonary edema is present . A small amount of pneumoperitoneum is noted under the right hemidiaphragm .
    OUTPUT:
    
1 . Left base opacity , which may represent a small effusion . Mild pulmonary edema . 2 . Pneumoperitoneum , which may be due to peritoneal dialysis . No acute cardiopulmonary process . Dr . ___ ___ Item 2 in results to Dr . ___ ___ telephone at 12 :44 p .m . on ___ .