Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are persistently low . This accentuates the size of the cardiac silhouette which appears mild to moderately enlarged but unchanged . Widening of the superior mediastinal contour is due to low lung volumes , an aortic knob remains distinct . Is crowding of the bronchovascular structures as a result of low lung volumes without with mild pulmonary vascular congestion . Patchy opacities are noted in the lung bases which likely reflect areas of atelectasis in the setting of low lung volumes . No pleural effusion or pneumothorax is identified . No acute osseous abnormality is detected .
    OUTPUT:
    
Low lung volumes . Mild pulmonary vascular congestion and bibasilar patchy opacities , likely atelectasis .