Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The reported abnormality on the prior study appears quite dense , measuring about 8 mm in diameter and continuing to overlie the left anterior first rib . This may reflect a small bone island and less likely an apical lung nodule . There has been apparent previous surgery in the left hemithorax with changes suggestive of left thoracotomy , accompanied by mild volume loss and areas of parenchymal and pleural scarring . Heart size is normal . Aorta is mildly tortuous . Right lung and pleural surfaces are clear .
    OUTPUT:
    
Dense left apical nodular opacity is not fully localized or characterized on this study but probably reflects a small bone island or calcified right apical granuloma . As the patient has apparently had prior surgery , there are likely prior outside radiographs that could be procured for comparison . This may be helpful to document retrospective stability and to avoid the need for further imaging such as a CT scan .