Doughnut sign on bone scan
The doughnut sign refers to bone scan pattern which demonstrate increased uptake peripherally with a photopenic center. This appearance may be seen in a number of cystic lesions include:
The doughnut sign is a nonspecific sign, and also can be present 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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