Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Minimal atelectasis is seen within the lung bases without focal consolidation . No pleural effusion or pneumothorax is present . There are mild degenerative changes noted in the thoracic spine . Bilateral rib deformities are re- demonstrated , and better assessed on the previous PET - CT .
    OUTPUT:
    
No acute cardiopulmonary abnormality .