Bone scans are typically described as being which?

Bone scans are typically described as being which?

• A. Not reliable
• B. Sensitive
• C. Specific
• D. Both sensitive and specific

Answer: (B)

This question tests sensitivity versus specificity in imaging. Bone scans detect areas of increased bone turnover, so they pick up abnormalities very well. That makes them highly sensitive: if something is altering bone metabolism, the scan is likely to show it, even if the lesion is small. However, many benign conditions—such as healing fractures, degenerative changes, arthritis, or infections—also cause increased tracer uptake, which lowers specificity. Because a positive bone scan cannot reliably distinguish malignant from benign processes without additional imaging, the typical description is that bone scans are highly sensitive but not specific. To improve specificity, clinicians often use CT or MRI or combine imaging with SPECT/CT for better anatomical correlation.

This question tests sensitivity versus specificity in imaging. Bone scans detect areas of increased bone turnover, so they pick up abnormalities very well. That makes them highly sensitive: if something is altering bone metabolism, the scan is likely to show it, even if the lesion is small. However, many benign conditions—such as healing fractures, degenerative changes, arthritis, or infections—also cause increased tracer uptake, which lowers specificity. Because a positive bone scan cannot reliably distinguish malignant from benign processes without additional imaging, the typical description is that bone scans are highly sensitive but not specific. To improve specificity, clinicians often use CT or MRI or combine imaging with SPECT/CT for better anatomical correlation.