Indian Journal of Nuclear Medicine
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CASE REPORT
Year : 2016  |  Volume : 31  |  Issue : 3  |  Page : 210-214

A case report of hyperfunctioning metastatic thyroid cancer and rare I-131 avid liver metastasis


National Cyclotron and PET Centre, Division of Nuclear Medicine, Chulabhorn Hospital, Bangkok, Thailand

Correspondence Address:
Anchisa Kunawudhi
Division of Nuclear Medicine, Chulabhorn Hospital, Bangkok 10210
Thailand
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-3919.183616

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Thyroid cancer is usually, relatively hypofunctional; most patients with thyroid cancer are clinically euthyroid. The combination of thyroid cancer and thyrotoxicosis is not common. We herein, report a case of follicular thyroid cancer with hyperfunctioning metastasis in a 43-year-old woman who presented with thyrotoxicosis, a cold right thyroid nodule, and low I-131 uptake at the thyroid bed. An additional total body scan with I-131 revealed a large radioiodine avid osteolytic bone metastasis with soft tissue masses and liver metastasis. The patient received treatment with total thyroidectomy, methimazole, and I-131 at a cumulative dose of 600 mCi along with recombinant human thyroid-stimulating hormone before the first I-131 treatment and palliative radiation. The patient had normal liver function test and experienced a mild degree of bone marrow suppression after I-131. At the 2-year follow-up, the patient was still alive with the progression of bone metastases but was doing well with less severe thyrotoxicosis, good ambulation, and an Eastern Cooperative Oncology Group performance status of 2. Clinicians should be aware of the unusual concurrent presentation of thyrotoxicosis and thyroid cancer, a differential diagnosis in patients with thyrotoxicosis and low or normal radioiodine uptake over the neck and also potential pitfalls during radionuclide treatment.


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