Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiac enlargement is unchanged when compared to the prior study . The mediastinal and hilar contours are stable . Minimal streaky opacity in the right lung base likely reflects atelectasis , and there is mild crowding of the bronchovascular structures due to slightly low lung volumes . There is no pleural effusion or pneumothorax . No acute osseous abnormality is present . Scoliosis of the thoracic spine , convex to the right is redemonstrated .
    OUTPUT:
    
Mildly reduced lung volumes with probable atelectasis in the right lung base .