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장기훈,김준성,조현진,김권천 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.1
The thyroid gland has been considered as an infrequent metastasis site. However, the incidence of thyroid involvement in reported autopsy series varies from 1.25% to 24%. In most autopsy series, breast and lung cancers have been the most frequent metastatic diseases to the thyroid gland, In contrast, renal cell carcinoma is the most frequent source of metastasis in clinical series. Many reports suggested that ultrasonography and subsequent ultrasonography-guided FNAB are mostly best suited for diagnosis of thyroid metastasis. Metastasis to the thyroid gland is associated with a poor prognosis and the prognosis depends essentially on the primary cancer. Surgery may prolong survival in a patient in whom the thyroid metastasis isolated, and thus early diagnosis and aggressive treatment should be performed in patients with the history of cancer.