Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . A moderate - sized left pleural effusion is unchanged , with associated left basal atelectasis . There is no right pleural effusion or pneumothorax . No consolidation or pulmonary edema is seen .
    OUTPUT:
    
Moderate - sized left pleural effusion with compressive left basal atelectasis .