title: Benign Schwannoma Mimicking Metastatic Lesion on F-18 FDG PET/CT in Differentiated Thyroid Cancer.
abstract: We report a case of benign schwannoma mimicking metastatic carcinoma. A 55-year-old female with papillary thyroid carcinoma underwent total thyroidectomy. F-18 fluorodeoxyglucose positron emission tomography/computed tomography (FDG PET/CT) demonstrated a focal hypermetabolic lesion with maximum standardized uptake value (SUVmax) 5.3 at the right chest wall. Conventional chest CT demonstrated a 5.4 cm ovoid mass lesion between the intercostal muscles and liver. Pathology revealed a schwannoma by tumor excision. This case demonstrates that benign schwannoma may demonstrate FDG uptake mimicking metastatic carcinoma.
authors.affiliation: Department of Nuclear Medicine, Catholic University of Daegu School of Medicine, 3056-6, Daemyung 4-Dong, Nam-Gu, Daegu, 705-718 South Korea.
authors.forename: Sungmin
authors.initials: S
authors.lastname: Kang
keywords: Differentiated thyroid cancer; F-18 FDG PET/CT; Mimicking carcinoma; Schwannoma