Doughnut sign on bone scan

Last revised by Dr Daniel J Bell on 15 Dec 2021

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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Cases and figures

  • Figure 1: doughnut
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  •  Case 1
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