Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Subsegmental atelectasis is seen in the left lung base . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Left basilar subsegmental atelectasis . No evidence for pneumonia or pleural effusion .