Intrathoracic Benign Goiter Imaged by 18F-FDG-PET: A Case Report.
A 55-year-old woman was referred for a suspicion of mediastinal tumor through plain X-ray photography (X-P). Magnetic resonance imaging (MRI) revealed a 3 cm diameter tumor which seemed to connect to the thyroid and projected into the mediastinum. A fine needle aspiration biopsy was tried but could not reach a conclusive diagnosis. Thereby, fluorine-18-fluorodeoxyglucose positron emission tomography (F-FDG-PET) was performed and a high accumulation was revealed with standardized uptake value (SUV) of 3.8. Thus, the right lobe excision procedure was enforced. The obtained tumor was continuous to the right lobe as expected. Microscopically, the encapsulated tumor consisted of atypical large-sized follicles without malignant characteristics. Thus, histological diagnosis was follicular thyroid adenoma.Thus, follicular adenoma of thyroid could present negative iodine-123-radioisotope (I-RI) uptake and positive F-FDG-PET accumulation.
From the Third Department of Internal Medicine, University of Fukui Faculty of Medical Sciences, Fukui, Japan (SW, TK, AS, TN, MI, KY, MI, TI); Department of Radiology, University of Fukui Faculty of Medical Sciences, Fukui, Japan (HK); and Biomedical Imaging Research Center, University of Fukui Faculty of Medical Sciences, Fukui, Japan (HO).
Shigeyuki
S
Wakahara
Tadashi
T
Konoshita
Ai
A
Sakai
Takahiro
T
Nakaya
Mai
M
Ichikawa
Katsushi
K
Yamamoto
Michiko
M
Imagawa
Hirohiko
H
Kimura
Hidehiko
H
Okazawa
Tamotsu
T
Ishizuka
D000236:Adenoma / Q000175:diagnosis*; D044963:Biopsy, Fine-Needle; D003937:Diagnosis, Differential; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D008875:Middle Aged; D049268:Positron-Emission Tomography / Q000379:methods*; D019275:Radiopharmaceuticals; D013964:Thyroid Neoplasms / Q000175:diagnosis*; D014965:X-Rays
D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18