Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate enlargement of the cardiac silhouette is somewhat obscured by the presence of a moderate left pleural effusion , relatively unchanged compared to the prior exam . Small right pleural effusion also persists . The mediastinal and hilar contours appear unchanged , with calcification of the thoracic aorta again noted . Lung volumes are reduced , with crowding of the bronchovascular structures but no overt pulmonary edema is present . Left basilar opacity likely reflects compressive atelectasis , but infection can not be excluded . Mild loss of height of a mid thoracic vertebral body is unchanged . No pneumothorax is detected .
    OUTPUT:
    
Moderate left and small right pleural effusions , relatively unchanged with persistent left basilar opacification likely reflecting compressive atelectasis . Infection , however , can not be completely excluded .