Double density sign (osteoid osteoma)

Last revised by Frank Gaillard on 27 Jul 2022

The double density sign, also sometimes clumsily referred to as the hotter spot within hot area sign, is a bone scan sign of an osteoid osteoma.

It refers to a central focus of intense uptake (the nidus) within a surrounding lower, but nonetheless increased uptake, rim.

See also

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Cases and figures

  • Case 1 - osteoid osteoma
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