Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the immediate prior study , a left base pleural drain has been removed . A small to moderate left pleural effusion has reaccumulated with mild associated atelectasis . Previously seen atelectasis at the right lung base has improved . Right - sided effusion is small , if present at all . There is no focal consolidation , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Interval re-accumulation of a small to moderate left pleural effusion .