Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Cardiac silhouette size remains mild to moderately enlarged . Aorta is unfolded . The mediastinal contours are similar . There is crowding of the bronchovascular markings with mild pulmonary vascular engorgement . Patchy atelectasis is seen in the lung bases without focal consolidation . There is likely a small left pleural effusion . No pneumothorax is present . There are mild degenerative changes demonstrated in the thoracic spine .
    OUTPUT:
    
Mild pulmonary vascular congestion , probable trace left pleural effusion and bibasilar atelectasis .