Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vascularity is normal . Streaky opacities in both lower lobes likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormalities are detected .
    OUTPUT:
    
Mild bilateral lower lobe atelectasis . Otherwise no acute cardiopulmonary abnormality .