Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left base opacity most likely represents a fat pad rather than pneumonia . No prior for comparison . The right lung is clear . No pleural effusion or pneumothorax is seen . The cardiac silhouette is normal in size . The aorta is somewhat tortuous . No pulmonary edema is seen . No displaced rib fracture is seen .
    OUTPUT:
    
No displaced rib fracture seen . If clinical concern persists rib series or CT is more sensitive .