Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a 9 mm round opacity overlying the right anterior second rib , which is also seen on the lateral view . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
9 mm round opacity in the right upper lobe . Recommend chest CT for confirmation and further characterization of this possible pulmonary nodule .