Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable semi-erect chest radiograph was obtained . Lung volumes are low . Small opacities at the right base likely represent a small amount of atelectasis . No effusion or pneumothorax is present . Cardiac and mediastinal contours are normal .
    OUTPUT:
    
Low lung volumes and minimal right lower lobe atelectasis .