Inflammatory Liver Tumor Caused by

Human fascioliasis is a rare parasitic disease outside of countries in which it is endemic. The diagnosis of hepatic-phase fascioliasis by diagnostic imaging alone is challenging. A 69-year-old female was referred to our hospital for the treatment of a solitary solid cystic mass lesion, 6 cm in diameter, accompanied with mild symptoms and minimal changes in laboratory parameters. Intrahepatic cholangiocarcinoma was suspected, and she underwent extended posterior sectionectomy. Four months later, she was re-admitted because of fatigue, high fever, and epigastric pain. Her eosinophil fraction and immunoglobulin E levels were extremely elevated (49.1% and 6833 IU/ml, respectively). She was found to have two new reticular cystic hepatic tumors. Serum dot enzyme-linked immunosorbent assay for parasites revealed strong positivity for Fasciola hepatica. Praziquantel was ineffective, and multi-cystic tumors rapidly developed in the left lateral section, requiring emergency left lateral sectionectomy. An F. hepatica helminth, approximately 3 cm in size, was observed on the cut liver surface during hepatic resection. Prophylactic triclabendazole (1,000 mg/day) was administered twice. She has been well for over 10 years without relapse of fascioliasis. In patients with hepatic tumors accompanied by inflammatory changes and eosinophilia, detailed medical history and serological testing by dot enzyme-linked immunosorbent assay for parasites are strongly recommended.

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