A doughnut sign of a hydatid cyst of the liver on F-18 FDG PET/CT.
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.
Demir
Hakan
H
Department of Nuclear Medicine, Kocaeli University School of Medicine, Kocaeli, Turkey. hakandemir99@yahoo.com
Halac
Metin
M
Yilmaz
Selda
S
Isgoren
Serkan
S
Sonmezoglu
Kerim
K
Uslu
Ilhami
I
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
D019788:Fluorodeoxyglucose F18