Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild to moderate cardiac silhouette enlargement persists . There is dense atherosclerotic calcification of the aortic knob . Low lung volumes are present , with mild pulmonary vascular congestion noted similar in extent compared to the previous exam . Trace bilateral pleural effusions have slightly decreased in size compared to the prior exam . Streaky opacities in the lung bases likely reflect atelectasis . No pneumothorax is identified . Moderate multilevel degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Mild pulmonary vascular congestion and small bilateral pleural effusions , improved compared to the previous exam .