Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is difficult to determine given the presence of moderate to large bilateral pleural effusions . Mediastinal contours are grossly unremarkable . There is no pulmonary edema or pneumothorax . Bibasilar airspace opacities likely reflect areas of compressive atelectasis , but infection or aspiration can not be excluded . There are no acute osseous abnormalities .
    OUTPUT:
    
Moderate to large bilateral pleural effusions with bibasilar airspace opacities , potentially atelectasis but infection or aspiration can not be excluded .