Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is of normal size with normal cardiomediastinal contours . Small medial right lung base and retrocardiac opacities are new since ___ . No pleural effusion or pneumothorax . Pulmonary vascular markings are normal . No radiopaque foreign body .
    OUTPUT:
    
New small bibasilar opacities , compatible with infection , atelectasis , or potentially aspiration .