Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are small bilateral layering pleural effusions . There is no focal consolidation , overt pulmonary edema or pneumothorax . The heart size is normal . Enlargement of the aortic knob is stable since ___ . There is no free air beneath the right hemidiaphragm .
    OUTPUT:
    
Small bilateral layering pleural effusions . No overt pulmonary edema .