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False-Positive I-131 Uptake by an Ovarian Serous Cystadenofibroma

Flug, Jonathan, MD, MBA; Lameka, Katherine, MD; Lee, Raymond, MD; Katz, Douglas S., MD, FACR; Sung, Wei-Wen, MD; Yung, Elizabeth, MD, FACR

doi: 10.1097/RLU.0b013e31823933d2
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We present the case of a 53-year-old woman after thyroidectomy with metastatic multifocal papillary carcinoma and encapsulated focal Hurthle cell carcinoma. Postoperatively, an I-131 whole-body scan revealed uptake in the low midline anterior neck. She was treated with 151.5 mCi of I-131. The 1-year follow-up I-131 whole-body scan revealed a new pelvic mass with I-131 uptake. Pelvic CT showed bilateral complex ovarian masses. She underwent surgical excision, revealing a right ovarian endometriotic cyst and a left ovarian cystadenofibroma, without thyroid tissue involvement. I-131 uptake in a cystadenofibroma is extremely rare and has been reported only once to our knowledge.

From the Department of Radiology, Division of Nuclear Medicine, Winthrop-University Hospital, Mineola, NY.

Received for publication, March 17, 2011; accepted, April 10, 2011.

Conflicts of interest and sources of funding: none declared.

Reprints: Jonathan Flug, MD, MBA, Department of Radiology, Division of Nuclear Medicine, Winthrop-University Hospital, 259 First St, Mineola, NY 11501. E-mail: jflug@winthrop.org.

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