Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . Heart size appears mildly enlarged . The mediastinal contours are unremarkable . Streaky opacities in the lung bases may reflect areas of atelectasis . There is no pleural effusion , focal consolidation , or pneumothorax . No pulmonary edema is seen . Patient is status post right mastectomy . Mild degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Low lung volumes . Streaky bibasilar airspace opacities may reflect atelectasis , but aspiration can not be completely excluded .