Doughnut sign on bone scan

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.

Inspired signs
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Article information

rID: 23434
Section: Signs
Tag: stub, cases
Synonyms or Alternate Spellings:
  • Doughnut sign of bone
  • Donut sign on bone scan

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Cases and figures

  • Figure 1: doughnut
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  •  Case 1
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