Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The mediastinal and hilar contours are unchanged , with mild unfolding of the thoracic aorta noted . Aortic knob calcifications are again seen . Pulmonary vascularity is normal . Minimal left basilar streaky opacity is compatible with atelectasis . Right lung is clear . No pleural effusion or pneumothorax is identified . No acute osseous abnormalities are seen .
    OUTPUT:
    
Minimal left basilar streaky atelectasis . No pneumothorax .