Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heterogeneous left basilar opacities do not have a correlate on the lateral radiograph and are likely minimal atelectasis . The lungs are otherwise clear . Mild pulmonary vascular congestion is not accompanied interstitial edema or pleural abnormality . Mild to moderate cardiomegaly is chronic . The thoracic aorta is generally enlarged , very tortuous and moderately calcified but neither focally aneurysmal nor changed since at least ___ . The patient has had midline sternotomy and CABG . A right cervical rib is seen . Multilevel degenerative changes of the thoracic spine include unchanged wedging of a lower thoracic vertebral body .
    OUTPUT:
    
1 . Mild left basal atelectasis ; no pneumonia . 2 . Chronic mild to moderate cardiomegaly and pulmonary venous hypertension , but no pulmonary edema . 3 . Chronically enlarged atherosclerotic thoracic aorta , with no focal aneurysm .