Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal with a left ventricular configuration . The mediastinal and hilar contours are unchanged with tortuosity of the thoracic aorta again noted . Atherosclerotic calcifications are seen at the aortic arch . Lung volumes are low . There is no pulmonary edema or focal consolidation . Minimal bibasilar atelectasis is visualized . No pleural effusion or pneumothorax is seen . Marked degenerative changes of both acromioclavicular and glenohumeral joints are re - demonstrated . There are no acute osseous abnormalities detected .
    OUTPUT:
    
Mild bibasilar atelectasis .