Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . The heart size is normal . The mediastinal contours are unremarkable . There are patchy left basilar and right perihilar opacities , findings which could reflect atelectasis , but infection can not be excluded . No pleural effusion or pneumothorax is visualized . The pulmonary vascularity is not engorged . Mild elevation of the left hemidiaphragm is noted . Dextroscoliosis of the thoracic spine is present . No acute osseous abnormalities are detected . No free air is seen under the diaphragms .
    OUTPUT:
    
Patchy left basilar and right perihilar opacities may reflect atelectasis though infection is not excluded in the correct clinical setting . Low lung volumes .