Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vascularity is normal . Streaky left lower lobe opacity likely reflects atelectasis . There is no focal consolidation , pleural effusion or pneumothorax . Mild degenerative changes are noted in the thoracic spine . Clips are seen in the right upper quadrant compatible with prior cholecystectomy .
    OUTPUT:
    
Streaky left lower lobe opacity likely reflects atelectasis .