Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains moderately enlarged . The mediastinal and hilar contours are unchanged with mild atherosclerotic calcifications noted at the aortic knob . There is mild pulmonary vascular congestion without overt pulmonary edema . Streaky opacities in the lung bases likely reflect areas of atelectasis . No pleural effusion or pneumothorax is clearly identified . Multilevel degenerative changes are again seen within the thoracic spine .
    OUTPUT:
    
Mild pulmonary vascular congestion and bibasilar atelectasis .