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.
From the *Department of Nuclear Medicine, Sir Run Run Shaw Hospital, Affiliated to School of Medicine, Zhejiang University, Hangzhou; and
†Department of Nuclear Medicine, The Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia, People's Republic of China.
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: email@example.com.