Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart size is mildly enlarged . Aortic knob is calcified . The aorta appears tortuous but unchanged . Mediastinal and hilar contours are stable . There is crowding of the bronchovascular structures but no pulmonary edema is present . Streaky bibasilar airspace opacities likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax thorax is seen . Clips are demonstrated overlying the left lung apex medially . There is no free air under the diaphragms .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis .