Abstract
Thyroid carcinomas with massive intralumen invasion of the great veins are extremely rare and reported to have poor prognosis. We report a case of a poorly differentiated follicular carcinoma of the thyroid with extensive invasion into the bilateral internal jugular veins, brachiocephalic vein, and superior vena cava. All of the seven major drainage veins from the thyroid were involved by tumor thrombus. The patient was successfully treated by surgical resection including removal of the tumor thrombus and repair of the great veins. The importance of preoperative radiological findings, treatment, and outcome are discussed along with a literature review.
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