Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The mediastinum takes on a globular shape and the cardiac sized is increased . Increased peripheral markings are consistent with edema versus low lung volumes . The left lower hemithorax is completely opacified , likely a combination of atelectasis and effusion . Certainly , pneumonia could also be considered in this area , although air bronchograms are not present . There is no pneumothorax . Old right sided rib fractures and chronic degenerative changes of both shoulders are present .
    OUTPUT:
    
Opacification of the left lower lung - atelectasis versus consolidation versus effusion . PA and lateral views of the chest may help further delineating the thoracic process .