Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta is mildly tortuous but unchanged . The mediastinal and hilar contours are similar . Pulmonary vasculature is normal . Minimal patchy opacity in the left lung base with peribronchial cuffing could reflect atelectasis , though infection is not completely excluded . No focal consolidation , pleural effusion or pneumothorax is visualized . There are multilevel degenerative changes are seen in the imaged thoracolumbar spine . S - shaped scoliosis of the thoracolumbar spine is also demonstrated .
    OUTPUT:
    
Minimal left basilar patchy opacity . This could reflect atelectasis though infection is not excluded .