Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear aside from a 5 mm well defined opacity projecting over the upper margin of the posterior right 7th rib . There is no pleural effusion or pneumothorax . The heart is normal in size . Normal cardiomediastinal silhouette .
    OUTPUT:
    
5 mm opacity projecting over the upper margin of the posterior right 7th rib . Further evaluation with shallow oblique chest radiographs is recommended . Please request that the images be reviewed by a radiologist before the patient leaves the Radiology Department . This information was entered in the radiology department 's online record for notification of critical results on ___ .