Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Comparison is made to a prior study of ___ . The heart is normal in size . The mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . The lungs are clear . There is obscuration of the costophrenic angle laterally and posteriorly on both sides . This is more prominent on the left than on the right .
    OUTPUT:
    
Small bilateral pleural effusions , left greater than right .