Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are substantial bilateral pleural effusions , at least moderate in size with associated parenchymal opacification , probably compatible with associated atelectasis in the lower lobes . Slight fullness of each hilum and indistinct contours suggest very mild congestion , but without frank congestive heart failure . There is no pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Substantial pleural effusions with associated opacities , probably compatible with associated atelectasis . Findings suggestive of slight perihilar congestion .