Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new large left pleural effusion with overlying atelectasis . No right pleural effusion is seen . No focal consolidation is seen on the right . There is no evidence of pneumothorax . Dual lead right - sided pacer device is similar in position . The cardiac silhouette size is difficult axially assessed due to the large left - sided opacity . Mediastinal contours are grossly unremarkable .
    OUTPUT:
    
Large left pleural effusion .