Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a small recurrent left pleural effusion , new since ___ . The small region of lateral costal margin pleural thickening is unchanged and seems to abut an old rib fracture . A tiny calcified nodule overlying the heart on lateral view is unchanged . The lungs are otherwise clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax . The pulmonary vascular markings are normal .
    OUTPUT:
    
1 . Recurrent small left pleural effusion . 2 . Stable pleural thickening at the left costal margin , abutting a probable healed rib fracture .