Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal radiographs of the chest demonstrate normal heart size . The aorta is tortuous . There is an 8 mm round opacity projecting over the right lower lung , which was further evaluated on subsequent chest CT and found to be a nipple shadow . The lungs are otherwise clear . No pleural effusion or pneumothorax . No displaced rib fracture identified .
    OUTPUT:
    
No evidence of acute process .