Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is mildly tortuous but unchanged . Mediastinal and hilar contours are otherwise unremarkable . Pulmonary vasculature is normal . Minimal atelectasis is noted in the left lung base . Right lung is clear . No pleural effusion or pneumothorax is identified . No acute osseous abnormalities seen .
    OUTPUT:
    
Minimal left basilar atelectasis .