Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . Lung volumes are low which results in crowding of the bronchovascular structures . No overt pulmonary edema is present . Patchy opacities are demonstrated in the lung bases , as seen on the previous radiograph , and not substantially changed . No pleural effusion or pneumothorax is present . No acute osseous abnormalities demonstrated . Mild degenerative changes are noted to the thoracic spine .
    OUTPUT:
    
Continued bibasilar patchy opacities . This may reflect atelectasis but pneumonia is not excluded . No pulmonary edema .