Which area lights up on a bone scan in a child due to high bone activity?

Which area lights up on a bone scan in a child due to high bone activity?

• A. Bladders
• B. Sternum
• C. Epiphysis in a child
• D. Calcaneus

Answer: (C)

Bone scans highlight areas of active bone formation, because the radiotracer taken up by the bone reflects osteoblastic activity. In children, the growth plates at the ends of long bones—the epiphyses—are sites of rapid bone turnover as bones grow. This makes the epiphyses light up prominently on pediatric scans. The pattern is driven by developmental biology: these plates are highly active, whereas in adults the growth plates have closed and show little uptake. Other areas like the bladder may show tracer due to urinary excretion, but the telltale pediatric finding is increased uptake at the epiphyses from ongoing growth.