Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . With no prior for comparison , frontal and lateral chest radiographs demonstrate a round opacity overlying the right lower chest on the frontal view , external to the patient , compatible with the patient 's known nipple ring per the radiology technologist . There is no parenchymal opacification , pleural effusion , or pneumothorax . The heart size is top normal , the mediastinal contours are unremarkable . The pulmonary vasculature is normal appearing .
    OUTPUT:
    
No acute chest pathology .