Fluorodeoxyglucose (FDG) hepatic superscan refers to the diffuse intense uptake of 18F-FDG in the liver on positron emission tomography (PET), with reduced physiological activity in the brain and heart. The common causes include lymphoma and metastasis. In this case report, we describe the imaging features of tuberculosis as a rare cause of FDG hepatic superscan. PET imaging may be the only clue to a diagnosis of hepatic tuberculosis, as other imaging modalities may demonstrate only nonspecific hepatomegaly. It is important to consider this entity in the differential diagnosis of patients presenting with FDG hepatic superscan and proceed with liver biopsy for a definitive diagnosis.
Brain ; diagnostic imaging ; Fluorodeoxyglucose F18 ; pharmacokinetics ; Heart ; diagnostic imaging ; Hepatomegaly ; chemically induced ; Humans ; Liver ; drug effects ; Lymphoma ; diagnostic imaging ; Male ; Middle Aged ; Positron-Emission Tomography ; Tuberculosis, Hepatic ; diagnosis ; Whole Body Imaging