Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: New since yesterday 's exam is a small left - sided pleural effusion . There is no visualized pneumothorax . The lungs are otherwise clear and the cardiomediastinal silhouette is stable . Cortical margin of the left lateral ninth rib laterally can not be followed , potentially fractured although dedicated rib series would be of use .
    OUTPUT:
    
New small left effusion since yesterday 's chest x-ray . Findings suspicious for left lateral rib fracture although not clearly defined on these images , consider dedicated rib series .