Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly and a tortuous thoracic aorta are unchanged . Atherosclerotic aortic calcifications are seen . A moderate - large right pleural effusion and associated compressive basilar atelectasis have improved since the prior study . No pulmonary edema , consolidation or pneumothorax is seen .
    OUTPUT:
    
Moderate to large right pleural effusion mildly improved since ___ .