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Doughnut phenomenon in bone scintigraphy.

D Front, R Hardoff

    Clinical Nuclear Medicine
    |March 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    The doughnut phenomenon in skull metastases from thyroid cancer is primarily caused by new bone formation. This finding was confirmed using advanced bone scintigraphy techniques.

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    Area of Science:

    • Nuclear Medicine
    • Oncology
    • Radiology

    Background:

    • Metastatic thyroid carcinoma can affect the skull.
    • The "doughnut phenomenon" is an observed pattern in bone scintigraphy for skull metastases.

    Purpose of the Study:

    • To investigate the underlying causes of the doughnut phenomenon in skull metastases.
    • To differentiate the roles of vascularity, permeability, and new bone formation.

    Main Methods:

    • Utilized bone scintigraphy with 99mTc-diphosphonate.
    • Employed 99mTc-labeled red blood cells and 99mTc-pertechnetate for dynamic and static imaging.
    • Analyzed lesion periphery and overall lesion characteristics.

    Main Results:

    • New bone formation was identified as the critical factor in the doughnut phenomenon.

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  • Delayed diphosphonate uptake was localized to the lesion periphery, indicating active bone remodeling.
  • This was observed despite increased vascularity and permeability within the metastatic lesions.

    • Conclusions:

    • New bone formation is the primary driver of the doughnut phenomenon in thyroid carcinoma skull metastases.
    • Bone scintigraphy can differentiate the contributions of vascular and bone-forming processes.
    • Understanding these mechanisms aids in interpreting metastatic bone disease imaging.