Final answer:
The appropriate method to evaluate for metastatic disease to the lung in a patient with grade 2 fibrosarcoma of bone is imaging studies, such as a chest radiograph or PET scan.
Step-by-step explanation:
When evaluating for metastatic disease to the lung in a patient with biopsy-proven grade 2 fibrosarcoma of bone, the appropriate method is to perform imaging studies. The best imaging technique to use in this case would be a chest radiograph or a PET scan. A chest radiograph can detect abnormalities in the lungs, such as opacities or abnormal distribution of material, while a PET scan can help identify areas of high metabolic activity, which is often seen in rapidly multiplying cancer cells.