Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . The aorta is tortuous . The mediastinal contours are unremarkable . There is mild upper zone vascular redistribution suggestive of mild pulmonary vascular congestion without frank pulmonary edema . Streaky bibasilar airspace opacities could reflect areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are moderate degenerative changes in the thoracic spine .
    OUTPUT:
    
Possible mild pulmonary vascular congestion and streaky bibasilar airspace opacities , likely atelectasis .