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    Patient with right hip pain during exercise. [18F]FDG-PET.

    Teaching Case

    Case presentation:

    • Female.
    • 45 y.o. -Right hip pain durin exercise.
    • History of resected melanoma 2 years before.
    • Plain X rays of pelvis and right limb were normal.
    • Since pain persited, a CT scan was ordered.

    Teaching points:

    • PET/CT is indicated for staging and re-staging of melanoma.
    • The technique has high sensitivity for detecting bone marrow involvement.
    • Although conventional bone scanning is sueful, PET/CT has the power of detecting also soft tissue involvement (in this case, however, the thyroid finding does not add to the prognosis).
    • Thyroid metastases from melanoma are no frequent. One paper reports on 5 incidental findings of thyroid metastases with FDG: 2 from melanoma, 2 from colotrectal cancer, 1 from gastric cancer.
    • ?Primary malignant thyroid carcinoma, especially papillary type, also take up FDG.

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