Doughnut sign of hepatic alveolar echinococcosis on FDG PET/CT: Clinical case report

Medicine
Guohua ShenAnren Kuang

Abstract

A characteristic metabolic finding of hepatic alveolar echinococcosis (HAE) on positron emission tomography/computed tomography (PET/CT) correlates with morphologic features on CT and magnetic resonance imaging (MRI). A young man from an endemic area was admitted to our hospital due to right upper quadrant pain for 2 months. CT and MRI revealed a heterogeneous mass with calcification, consisting of central necrosis and peripheral solid inflammatory tissues. Accordingly, FDG PET/CT demonstrated a characteristic metabolic finding of doughnut sign. Combining the above characteristic imaging features with positive serologic findings, the patient was diagnosed as HAE. He then underwent extracorporeal hepatectomy and liver autotransplantation followed by medical treatment of benzimidazoles. He remained asymptomatic without evidence of recurrence at 2-year follow-up. The characteristic metabolic appearance of HAE on FDG PET/CT, correlated with its morphologic features of CT and MRI, may allow to make accurate diagnoses.

References

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