Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . Mediastinal and hilar contours are unremarkable . Mild atherosclerotic calcifications are seen at the aortic knob . There is no pulmonary vascular congestion . Small to moderate size left pleural effusion and a trace right pleural effusion are new compared to the previous exams . Patchy bibasilar airspace opacities are more pronounced on the left , and could reflect compressive atelectasis though infection or aspiration are not excluded . There is no pneumothorax . No acute osseous abnormalities demonstrated .
    OUTPUT:
    
Small to moderate size left , and trace right pleural effusions , new compared to the previous exams . Bibasilar airspace opacities are more pronounced on the left , and could reflect compressive atelectasis though infection or aspiration can not be completely excluded .