Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is within normal limits . The aorta remains unfolded . Mediastinal and hilar contours are unchanged , and pulmonary vasculature is not engorged . Low lung volumes are present with patchy opacities in the lung bases , findings which may reflect atelectasis . Infection can not be completely excluded . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with patchy opacities in the lung bases , potentially atelectasis , but infection is not excluded in the correct clinical setting .