Abstract
Thyrotoxicosis is a common condition associated with excess circulating thyroid hormones. Rarely, thyrotoxicosis can be developing due to functioning metastatic thyroid carcinoma. Most of patients with functional thyroid cancer metastases have had normal thyroxine (T4) concentrations but high serum triiodothyronine (T3-thyrotoxicosis). Inappropriately supressed TSH levels with normal T4 levels may be helpful to suspect T3 thyrotoxicosis. In this case report we present a case of thyrotoxicosis due to metastatic follicular thyroid cancer with a huge metastatic lesion.
Highlights
Thyrotoxicosis is a common condition associated with excess circulating thyroid hormones
Thyrotoxicosis may develop due to metastatic thyroid carcinoma
Supressed Thyroid Stimulating Hormone (TSH) level with normal T4 level may be an indicator of T3 thyrotoxicosis
Summary
Thyrotoxicosis is a common condition associated with excess circulating thyroid hormones. The patient had thyroidectomy history 10 years ago due to multinodular goitre. She had not informed about her thyroid pathology. She had noticed a growing mass on the right shoulder for few years. Biopsy of the mass had been performed and pathological examination revealed the thyroid follicular cancer. The patient’s elevated alkaline phosphatase and residual thyroid tissue (19X11mm) could be observed at the right side of the neck by ultrasonographic examination. The MRI scan of the right shoulder showed a huge mass (150X111 mm), which includes bone and soft tissue (Figure-2a/2b).
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