Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are unchanged , with the heart size within normal limits . The pulmonary vasculature is not engorged . Re - demonstrated within the left lung base is subsegmental atelectasis without focal consolidation . The right lung is clear . No pleural effusion or pneumothorax is present . No acute osseous abnormality is detected .
    OUTPUT:
    
Unchanged left basilar subsegmental atelectasis . No new focal consolidation .