Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is at the upper limits of normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . The upper lungs are clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . There are multiple remote left posterior rib fractures .
    OUTPUT:
    
The upper lungs are clear . The lower lungs are not well evaluated . Recommend oblique views for further evaluation .