Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal with a left ventricular configuration . The aorta is mildly tortuous . Mediastinal and hilar contours are otherwise unremarkable . Streaky retrocardiac opacity likely reflects atelectasis . Remainder of the lungs are clear . No pleural effusion or pneumothorax is identified . Lungs are slightly hyperinflated with flattening of the diaphragms . Pulmonary vascularity is normal . Multiple remote left - sided rib fractures are demonstrated . No acute osseous abnormalities otherwise seen .
    OUTPUT:
    
Retrocardiac streaky opacity likely atelectasis .