Thyroid metastasis from chondrosarcoma.

For chondrosarcoma, metastasis to the thyroid gland is extremely rare. The diagnosis and treatment of thyroid metastasis from chondrosarcoma are discussed here.We found a case of thyroid malignancy occurring after treatment of chondrosarcoma. We reviewed patient characteristics, histological presentations on initial chondrosarcoma and thyroid metastasis, treatments, times of recurrence and death. In addition, we searched Embase, PubMed, and ISI Web of Science databases (1996-2018) for articles published in the English language using the key words "chondrosarcoma" and "thyroid" and we reviewed almost all the reports about thyroid metastasis from chondrosarcoma.Only 5 cases of chondrosarcoma metastases in the thyroid gland have been reported in the literature. We found that most patients are adults, with compression signs or pain, most of whom have poor prognoses. The main examinations are ultrasound, CT and fine needle aspiration biopsy, and primary treatment is surgery.These rare cases of chondrosarcoma presenting as a metastasis in the thyroid gland highlight the importance of close communication between radiologists, histopathologists, and clinicians to ensure that such exceptional cases are not missed.