Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Top - normal heart size is stable compared to the prior exams dated back to ___ . The the aorta is tortuous , otherwise the hilar and mediastinal contours are unremarkable . Note is made of mild bibasilar atelectasis . There is no pleural effusion or pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
No acute intrathoracic abnormalities identified . Mild bibasilar atelectasis .