title: Normal thymic uptake of 2-deoxy-2[F-18]fluoro-D-glucose.
abstract: Whole-body 2-deoxy-2-[F-18]fluoro-D-glucose (FDG) positron emission tomography (PET) of a 54-year-old woman with a history of recurrent thyroid follicular cancer and an elevated thyroglobulin level showed significant FDG uptake in the thyroid bed and anterior mediastinum. A previous scan after high-dose I-131 therapy also showed iodine uptake in these regions. Because of a lack of response to iodine therapy, the patient had surgery. Recurrent thyroid cancer was found in the neck, but the mediastinal lesion was shown to consist of normal thymus tissue. In repeated examinations performed after surgery, there was no uptake of FDG or I-131 in the anterior mediastinum. Previous treatment with a high dose of radioiodine may have contributed to visualization of a normal adult thymus with FDG PET.
authors.affiliation: Department of Diagnostic Radiology and Nuclear Medicine, Rush-Presbyterian-St. Luke's Medical Center, Chicago, Illinois 60612, USA.
authors.forename: H
authors.initials: H
authors.lastname: Alibazoglu
authors.forename: B
authors.initials: B
authors.lastname: Alibazoglu
authors.forename: E F
authors.initials: EF
authors.lastname: Hollinger
authors.forename: S A
authors.initials: SA
authors.lastname: Ingram
authors.forename: W A
authors.initials: WA
authors.lastname: Willoughby
authors.forename: G
authors.initials: G
authors.lastname: LaMonica
authors.forename: A
authors.initials: A
authors.lastname: Ali
mesh_terms: D018263:Adenocarcinoma, Follicular / Q000000981:diagnostic imaging / Q000532:radiotherapy; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D007457:Iodine Radioisotopes / Q000627:therapeutic use; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000000981:diagnostic imaging; D019275:Radiopharmaceuticals; D013950:Thymus Gland / Q000000981:diagnostic imaging*; D013964:Thyroid Neoplasms / Q000000981:diagnostic imaging / Q000532:radiotherapy; D014055:Tomography, Emission-Computed
chemical_list: D007457:Iodine Radioisotopes; D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18