Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is top normal in size but stable . The mediastinal and hilar contours are within normal limits . The lungs are clear with the exception of trace bilateral layering effusion . There is no pneumothorax or pulmonary vascular congestion . Chest wall deformities related to multilevel prior rib fractures are unchanged . There is diffuse osseous demineralization , in keeping with age .
    OUTPUT:
    
Small bilateral pleural effusions .