Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . This accentuates the size of the cardiac silhouette which is mildly enlarged . The mediastinal and hilar contours are stable , with minimal atherosclerotic calcification noted at the aortic knob . The pulmonary vasculature is normal . Minimal patchy opacity in the left lung base likely reflects atelectasis . No pleural effusion or pneumothorax is demonstrated . No acute osseous abnormalities seen .
    OUTPUT:
    
Minimal left basilar atelectasis .