Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Streaky opacity within the left lower lobe likely reflects atelectasis . The right lung is clear . No pleural effusion or pneumothorax is present . No acute osseous abnormality is detected .
    OUTPUT:
    
Left lower lobe streaky opacity , likely atelectasis .