Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . Minimal atelectasis is noted in the left lung base . The right lung is clear . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Minimal left basilar atelectasis . Otherwise no acute cardiopulmonary abnormality .