Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged , unchanged . Mediastinal and hilar contours are similar . Patchy opacities in the lung bases likely reflect areas of atelectasis . No pulmonary edema is present , and there is no pleural effusion . No pneumothorax is identified . No acute osseous abnormality is detected .
    OUTPUT:
    
Bibasilar patchy opacities , likely atelectasis . Infection is not completely excluded .