Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large left pleural effusion , increased since the prior study in ___ with subsequent shift of the mediastinum to the right . There is resultant extensive atelectasis at the left lung base , and underlying consolidation is not excluded . There is likely also a small right pleural effusion , but aeration of the right lower lung is mostly improved . There is no pneumothorax . Mild pulmonary edema is also noted . The cardiac silhouette size can not be assessed due to obscuration by the left pleural effusion . Calcification in the aortic knob is again seen .
    OUTPUT:
    
Large left pleural effusion , increased compared to prior , with presumed subsequent collapse of the left lower lobe and probably lingula . Underlying consolidation is not excluded .