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Bone healing misdiagnosed as recurrent osteoid osteoma.

Focal increase in concentration of bone-seeking isotopes occurs in many pathological conditions including healing fractures, infection and metastatic deposits. Osteotomy frequently provokes comparatively little scintigraphically evident reaction, and the scintigraphic appearance commonly reverts to normal within a few months. Following fracture, on the other hand, increased uptake persists for a time which depends on the site, severity of trauma and possibly other undefined factors. Uptake may revert to normal within as little as eight weeks with effective immobilisation of a simple undisplaced fracture. At the other extreme increased uptake has been observed over thirty years after injury (Matin, 1979).