Double density sign on bone scan is said to be diagnostic of (DNB June 2011)
|A||Aneurysmal bone cyst|
|D||Unicameral bone cyst|
a. A bone scan is usually helpful in identifying osteoid osteomas which may be missed on routine X-rays.
b. The double density sign which is a focal area of increased uptake with a second smaller area of increased uptake superimposed is supposed to be diagnostic of osteoid osteoma