Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is a moderate new pleural effusion on the right . A small to moderate pleural effusion is new on the left . In each case , there are patchy associated opacities , not specific but compatible with atelectasis . Associated infection can not be excluded , however , although pleural effusions are seen most likely to represent the primary abnormality . There is no pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Substantial bilateral pleural effusions with associated opacities , probably attributable atelectasis ; an infectious process is difficult to completely exclude , however .