Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the immediate prior radiograph there has been interval reaccumulation of a large left pleural effusion with associated compressive atelectasis of the entire left lower lobe . A small amount of aeration is still seen within the left upper lobe with persistent left upper lobe opacities similar to the prior study , which may represent pneumonia , metastatic disease , or pulmonary hemorrhage . A small amount of air laterally may represent persistent aeration in the left upper lobe or a small locule of air within the effusion . There is a trace right pleural effusion . The right lung is otherwise clear . The cardiomediastinal silhouette is obscured by the large left pleural effusion .
    OUTPUT:
    
1 . Interval reaccumulation of a large left pleural effusion with associated compressive atelectasis of the entire left lower lobe . 2 . Persistent opacities in the partially aerated left upper lobe may represent pneumonia , metastatic disease , or pulmonary hemorrhage , similar in appearance to the prior study .