Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded and clear . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . There is mild atelectasis at the left base . No pleural effusion or pneumothorax is detected .
    OUTPUT:
    
Mild atelectasis at the left base , otherwise unremarkable radiographs of the chest .