Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slightly asymmetric increased opacity in the left lower lobe persists but appears to have improved compared to the prior exam , likely reflecting atelectasis . No definite focal consolidation , pleural effusion , edema , or pneumothorax . The heart is normal in size . The mediastinum is not widened . The aortic knob is calcified . Extensive distension of multiple loops of bowel with inter in the visualized that abdomen is noted . There is free air under the diaphragm . Surgical clips project over the right upper abdomen , perhaps related to cholecystectomy .
    OUTPUT:
    
1 . No definite focal pneumonia . 2 . Pneumoperitoneum .