Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest were acquired . Lung volumes are low , limiting assessment for mild vascular congestion secondary to crowding of the bronchovasculature . The lungs are clear . The heart size is normal . The mediastinal contours are normal . Note is made of an azygos lobe , a normal anatomic variant . There are no pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
Low lung volumes . No acute cardiac or pulmonary process .