Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A large right pleural effusion is present with compressive right basilar atelectasis . There is mild shift of the mediastinal structures towards the left . Heart size is difficult to assess given the presence of the large pleural effusion . No pulmonary vascular engorgement is present . Patchy opacity in the left lung base may reflect atelectasis , though infection is not excluded in the correct clinical setting . No left - sided pleural effusion or pneumothorax is present .
    OUTPUT:
    
1 . Large right pleural effusion with compressive right basilar atelectasis . 2 . Patchy opacity in the left lung base may reflect atelectasis , but infection is not excluded in the correct clinical setting .