Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . The cardiac , mediastinal and hilar contours are unchanged , with tortuosity of the thoracic aorta redemonstrated . Pulmonary vascularity is normal . Streaky opacities in the lung bases are similar when compared to the prior exam and likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
Streaky opacities in the lung bases most likely reflective of atelectasis , and similar when compared to the prior study . Infection or aspiration at the lung bases , however , can not be completely excluded .