Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged but unchanged . Mediastinal and hilar contours are similar with unchanged prominence of the right superior mediastinal contour likely due to tortuous vasculature . Mild upper zone vascular redistribution suggests mild pulmonary vascular congestion . Streaky opacities in the lung bases likely reflect areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . Mild degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Mild pulmonary vascular congestion and streaky bibasilar atelectasis .