Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged , unchanged . The aorta remains tortuous with mild atherosclerotic calcifications . The mediastinal and hilar contours are otherwise unchanged . The pulmonary vasculature is normal . Minimal patchy opacity within the right lung base likely reflects atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen . Left apical scarring is similar . At Mild S - shaped scoliosis of the thoracolumbar spine is re - demonstrated .
    OUTPUT:
    
Patchy opacity within the right lung base likely reflects atelectasis . .