Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left pectoral pacemaker remains in place . An accessed right pectoral MediPort terminates in the upper right atrium . A moderate left pleural effusion has increased since ___ . Retrocardiac opacification has also increased , most likely due to a combination of pleural effusion and atelectasis . The right lung remains clear . There is no pneumothorax . The heart and mediastinum are within normal limits . Extensive calcification of the thoracic aorta is again noted . Spinal degenerative changes are stable .
    OUTPUT:
    
Increased moderate left pleural effusion with adjacent left lower lobe opacification which is likely due to atelectasis , but left lower lobe pneumonia is possible in the appropriate clinical context .