Abstract
Metastatic bone tumors are the most common malignant tumor involving bone. Bone metastases from primary tumors of unknown origin are commonly attributed to prostate, breast, lung, and thyroid. 18F-fluorodeoxyglucose (FDG) Positron Emission Tomography- Computed Tomography (PET-CT) has a very useful imaging modality to identify primary site in patients with suspicious bone metastasis. However, it remained unclear whether PET-CT have clinical value to identify primary site because some cancer types have low FDG-avidity. We report a case of 84-year-old female patient presenting with metastatic bone tumor in skull without showing any metabolic activity in primary site of her thyroid gland on FDG PET-CT and we discussed how to use other clinical information in this patient. Bangladesh J. Nuclear Med. 23(1&2): 63-66, 2020
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