Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild to moderate enlargement of the cardiac silhouette , new since prior exams . The mediastinal contours are within normal limits . The bilateral hila are somewhat obscured by parenchymal opacities . There are diffuse bilateral airspace opacities , less prominent in the upper lobes bilaterally , new since prior exam . There is biapical pleural parenchymal scarring . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Diffuse bilateral airspace opacities are nonspecific , however may represent severe pulmonary edema , diffuse alveolar hemorrhage , ARDS , and / or multifocal infection . 2 . New at least moderate cardiomegaly since prior exams from ___ raises concern for pericardial effusion . No radiographic evidence of tamponade .