Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is rotated to the left . Single lead right - sided pacemaker is again seen with lead extending to the expected location of the right ventricle , unchanged . Midline tracheostomy tube is seen . There is a small to moderate left pleural effusion with overlying atelectasis . Left base retrocardiac opacity most likely represent combination of pleural effusion and atelectasis although underlying consolidation is not excluded in the appropriate clinical setting . The right costophrenic angle is not fully included on the frontal view although there may be a trace right pleural effusion . Right base linear atelectasis / scarring is seen . The cardiac and mediastinal silhouettes are unremarkable . No pneumothorax is seen .
    OUTPUT:
    
Small to moderate left pleural effusion with overlying atelectasis . Left base retrocardiac opacity may represent combination of pleural effusion and atelectasis , underlying consolidation is not excluded in the appropriate clinical setting .