RT Journal Article SR Electronic T1 Radioactive Iodine as a Single-Modality Treatment in a Tumor Thrombus Arising from Follicular Thyroid Carcinoma JF Journal of Nuclear Medicine Technology JO J. Nucl. Med. Technol. FD Society of Nuclear Medicine SP 82 OP 83 DO 10.2967/jnmt.120.247122 VO 49 IS 1 A1 Anwin Joseph Kavanal A1 Deepa Singh A1 Ashwani Sood A1 Sharath B. Kumar A1 Swayamjeet Satapathy A1 Bhagwant Rai Mittal YR 2021 UL http://tech.snmjournals.org/content/49/1/82.abstract AB On rare occasions, differentiated thyroid carcinoma causes tumor thrombosis in the great veins. Multimodality treatment with surgery, radioiodine therapy, and targeted therapies is used to manage tumor thrombosis associated with thyroid malignancies, though no established guidelines exist. We present a woman with a tracer-avid tumor thrombus in the right brachiocephalic vein after surgery for follicular thyroid carcinoma. Follow-up revealed an excellent response after treatment with 131I as a single modality for both remnant and tumor thrombus.