Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The aorta demonstrates mild tortuosity , but no aneurysmal dilatation . There is a moderate left pleural effusion which has grown in size compared to prior exam , with underlying atelectasis . The right lung is clear . There is no pneumothorax .
    OUTPUT:
    
Progression of moderate left pleural effusion with underlying atelectasis .