Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . Mediastinal contours are unremarkable . There is mild pulmonary vascular congestion . Patchy opacities in the lung bases likely reflect areas of atelectasis . No focal consolidation , pneumothorax , or pleural effusion is present . No acute osseous abnormality is detected . Mild degenerative changes are noted in the imaged thoracic spine .
    OUTPUT:
    
Mild pulmonary vascular congestion and bibasilar atelectasis .