title: A doughnut sign of a hydatid cyst of the liver on F-18 FDG PET/CT.
abstract: A 59-year-old man underwent a whole-body PET/CT scan to evaluate the metabolic activity of a nodule in the upper lobe of the left lung seen on CT. Slightly increased peripheral activity with a large hypometabolic region centrally, a so-called doughnut sign, was seen in the right lobe of the liver. After the diagnosis of a hydatid cyst of the liver, the patient underwent surgery. This case demonstrates a hydatid cyst that caused increased F-18 FDG uptake as a doughnut pattern.
authors.affiliation: Department of Nuclear Medicine, Kocaeli University School of Medicine, Kocaeli, Turkey. hakandemir99@yahoo.com
authors.forename: Hakan
authors.initials: H
authors.lastname: Demir
authors.forename: Metin
authors.initials: M
authors.lastname: Halac
authors.forename: Selda
authors.initials: S
authors.lastname: Yilmaz
authors.forename: Serkan
authors.initials: S
authors.lastname: Isgoren
authors.forename: Kerim
authors.initials: K
authors.lastname: Sonmezoglu
authors.forename: Ilhami
authors.initials: I
authors.lastname: Uslu
mesh_terms: D004444:Echinococcosis, Hepatic / Q000000981:diagnostic imaging* / Q000473:pathology*; D019788:Fluorodeoxyglucose F18; D006801:Humans; D008297:Male; D008875:Middle Aged; D049268:Positron-Emission Tomography; D014057:Tomography, X-Ray Computed
chemical_list: D019788:Fluorodeoxyglucose F18