Doughnut sign on bone scan

Doughnut sign
on bone scinigraphy • Aneurysmal bone cyst (ABC) - Ganzer Fall bei Radiopaedia

Target sign
(intussusception) • Doughnut (photo) - Ganzer Fall bei Radiopaedia
The doughnut sign refers to the bone scan pattern whereby there is increased uptake peripherally with a photopenic center. This appearance may be seen in a number of cystic lesions including:
The doughnut sign is a non-specific sign, and can also be seen in chondrosarcoma, telangiectatic osteosarcoma and any other lesions that show aneurysmal bone cyst changes within. It has also been described in non-traumatic avascular necrosis.
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