Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate an opacity measuring approximately 1 .5 cm overlying the fifth posterior rib which was present in ___ , but was not present in ___ . An additional opacity overlying the ninth rib is most likely a nipple shadow . Otherwise , the lungs are clear . Cardiac silhouette is normal . No pleural effusion or pneumothorax .
    OUTPUT:
    
1 .5 cm opacity overlying the right seventh rib . This was present at least in ___ , but not in ___ . Would recommend evaluating with a non-contrast chest CT .