Diagnostic clue of nodular fasciitis mimicking metastasis in papillary thyroid cancer, mismatching findings on 18F-FDG PET/CT and 123I whole body scan: A case report

Seo,Minjung; Kim,Misung; Kim,Eun  Sook; Sim,Hongbo; Jun,Sungmin; Park,Seol  Hoon

doi:10.3892/ol.2017.6181

Diagnostic clue of nodular fasciitis mimicking metastasis in papillary thyroid cancer, mismatching findings on 18F-FDG PET/CT and 123I whole body scan: A case report

Authors:
- Minjung Seo
- Misung Kim
- Eun Sook Kim
- Hongbo Sim
- Sungmin Jun
- Seol Hoon Park
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Affiliations: Department of Nuclear Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan 44033, Republic of Korea, Department of Pathology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan 44033, Republic of Korea, Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan 44033, Republic of Korea, Department of Neurosurgery, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan 44033, Republic of Korea, Department of Nuclear Medicine, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan 49267, Republic of Korea
Published online on: May 17, 2017 https://doi.org/10.3892/ol.2017.6181
Pages: 1167-1171

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Abstract

This study reports a case of nodular fasciitis incidentally detected in a patient with papillary thyroid cancer. A 47-year-old woman underwent a total thyroidectomy and radioactive iodine therapy for papillary thyroid cancer. On a follow‑up fluorodeoxyglucose (18F‑FDG) PET/computed tomography (CT) scan after 12 months, a focal 18F‑FDG‑avid lesion was incidentally detected in the paraspinal muscle. It was well‑enhanced on CT and magnetic resonance imaging, indicating metastasis. However, the lesion was not iodine avid on the 123I whole body scan, which favored benign etiology over metastasis from thyroid cancer. For pathological confirmation, surgical excision was performed and the paraspinal lesion was finally confirmed as nodular fasciitis. Therefore, it was suggested that nodular fasciitis may be included in the differential diagnosis of a 18F‑FDG avid/iodine non‑avid soft tissue lesion in patients with thyroid cancer. In such circumstances, 123I whole body scans may serve a role in non‑invasive work‑up, and prevent unnecessary surgical procedures.

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