Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is left - sided volume loss with an increased pleural effusion when compared with ___ . Retrocardiac atelectasis has also increased , and superimposed pneumonia can not be ruled out in the proper clinical setting . Evaluation is limited by the left scapula projecting over the the area of concern . Lateral views may also be helpful if clinically feasible . The right lung is clear . There is no pulmonary vascular congestion or pneumothorax . A surgical clip projects over the left tracheobronchial angle .
    OUTPUT:
    
Increasing left - sided pleural effusion , now moderate with adjacent compressive atelectasis . Superimposed pneumonia is possible in the proper clinical setting .