Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A large left pleural effusion has substantially increased in size compared to the previous radiograph . Heart size is mildly enlarged . Left basilar opacity likely reflects compressive atelectasis though infection can not be excluded . Patchy opacity in the right lung base also could reflect atelectasis . Trivial right pleural effusion is present . No pulmonary edema or pneumothorax is visualized . Multilevel degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Increased size of left pleural effusion which is now large with left basilar opacity , likely atelectasis , but infection can not be excluded . Patchy right basilar opacity may reflect atelectasis . Tiny right pleural effusion .