Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Subsegmental atelectasis is noted in the left lower lobe . Remainder the lungs are clear . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormality is visualized .
    OUTPUT:
    
Subsegmental left lower lobe atelectasis . Otherwise , no acute cardiopulmonary process .