Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well aerated and clear . There is an ill defined opacity overlying the right 7th rib posteriorly which , in the absence of a history of a known cancer , is most likely insignificant and possibly representative of sclerotic rib . Mediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Ill - defined opacity overlying the right 7th rib posteriorly with which in the absence of known cancer , is probably insignificant . 2 . No findings to suggest infection .