Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac size is normal . Aside from retrocardiac opacities , the lungs are clear . There is no pneumothorax . There is a small left effusion . Pneumoperitoneum is again noted . Tracheostomy tube is in standard position . Right central catheter tip is in the cavoatrial junction .
    OUTPUT:
    
Retrocardiac opacities associated with adjacent pleural effusion these could represent atelectasis or aspiration in the appropriate clinical setting Pneumoperitoneum