Focally Increased Iodine Activity in a Small Thymic Cyst

A 40-year-old man with biopsy-proven papillary thyroid cancer received 131I radiotherapy. Posttherapy scan showed not only multiple foci of intense activity in the neck but also a small focal activity in the region of right upper mediastinum, confirmed by SPECT/CT images. This activity was suspected as mediastinal lymph node metastasis. However, pathology examination after the resection showed thymic cyst. Received for publication December 26, 2018; revision accepted December 30, 2018. Conflicts of interest and sources of funding: none declared. Correspondence to: Cen Lou, MD, Department of Nuclear Medicine, Sir Run Run Shaw Hospital, Affiliated to School of Medicine, Zhejiang University, 3 East Qingchun Rd, Jianggan District, Hangzhou, Zhejiang, People's Republic of China. E-mail: 3194110@zju.edu.cn. Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.

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