Intravenous Tumor Thrombus From Papillary Carcinoma of Thyroid Demonstrated by 18F-FDG PET/CT.

Wang, Yu; Jiang, Lisha; Zhang, Xinyue; Xu, Yangmengyuan; Liu, Bin · Clin Nucl Med · 2022

case_report · Level V

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Abstract

A 24-year-old man with papillary thyroid carcinoma underwent 131I ablation after thyroidectomy. On posttherapy whole-body scintigraphy, only the remnant thyroid was visualized. In view of elevated unstimulated thyroglobulin level 7 months after 131I ablation, 18F-FDG PET/CT scan was ordered for further evaluation. On PET/CT images, a large filling defect from the dilated left brachiocephalic vein to superior vena cava was noted corresponding with high FDG uptake. It was considered as a malignant thrombus.

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