Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lower lung volumes seen on the current exam with secondary bibasilar atelectasis . Superiorly , the lungs are clear and there is no edema . Tortuous course of the thoracic aorta , particularly at the arch is similar to prior . Median sternotomy wires and mediastinal clips are again noted . Cardiac silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process .