Subacute Venous Infarct Mimicking Cerebral Metastasis in 18F-FDG PET/CT

A 68-year-old woman with colon carcinoma was referred to 18F-FDG PET/CT imaging for staging. In addition to primary tumor involvement, PET/CT demonstrated focal FDG uptake in the right temporal lobe suggestive of primary brain tumor or metastasis. To delineate the lesion, a brain MRI scan showed sigmoid sinus thrombosis and vasogenic edema in the right temporal lobe. The patient presented a history of right-sided headache that began 1 week before the PET/CT. Neurological examination and MRI findings were concluded as subacute venous infarct due to sigmoid sinus thrombosis and that is a potential cause for false-positive FDG uptake on PET/CT. Received for publication October 1, 2018; revision accepted October 11, 2018. Conflicts of interest and sources of funding: none declared. Correspondence to: Cihan Gündoğan, MD, Department of Nuclear Medicine, University of Health Sciences, Istanbul Training and Research Hospital, 34098, Fatih, Istanbul, Turkey. E-mail: cihangd@hotmail.com. Copyright © 2018 Wolters Kluwer Health, Inc. All rights reserved.

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