Which statement about bone scans is true?

Which statement about bone scans is true?

• A. They are sensitive for detecting bone pathology
• B. They are highly specific for identifying tumors only
• C. They are not used for infection
• D. They have no clinical use

Answer: (A)

Bone scans are highly sensitive for detecting bone pathology because the radiotracer accumulates in areas of increased osteoblastic activity, allowing the whole skeleton to be surveyed for abnormalities. This means many conditions that stimulate bone turnover—such as metastases, osteomyelitis, fractures, stress injuries, and inflammatory arthropathies—can be detected even when other imaging looks normal. The trade-off is specificity: increased uptake appears in a variety of disorders, so the scan can’t reliably distinguish tumor from infection or inflammation on its own. That’s why the statement about being highly specific for identifying tumors only isn’t correct. Bone scans are indeed used to evaluate infection and have broad clinical utility in cancer staging and other bone disorders, so claims that they have no clinical use are also incorrect.

Bone scans are highly sensitive for detecting bone pathology because the radiotracer accumulates in areas of increased osteoblastic activity, allowing the whole skeleton to be surveyed for abnormalities. This means many conditions that stimulate bone turnover—such as metastases, osteomyelitis, fractures, stress injuries, and inflammatory arthropathies—can be detected even when other imaging looks normal.

The trade-off is specificity: increased uptake appears in a variety of disorders, so the scan can’t reliably distinguish tumor from infection or inflammation on its own. That’s why the statement about being highly specific for identifying tumors only isn’t correct. Bone scans are indeed used to evaluate infection and have broad clinical utility in cancer staging and other bone disorders, so claims that they have no clinical use are also incorrect.