摘要：

A 69-year-old man was referred to our department for resection of a growing mass in S4 of the liver. The results of a biopsy conducted at his previous hospital showed non-alcoholic steatohepatitis with no liver dysfunction. HBs antigen and HCV antibody tests were both negative, and the levels of the tumor markers CEA, CA19-9, AFP, and PIVKA II were within normal limits. Abdominal ultrasound showed a hypoechoic mass in the left lobe of the liver, and computed tomography and magnetic resonance imaging showed that, although the tumor was ischemic, its interior was penetrated by blood vessels. Malignant lymphoma of the liver or cholangiocarcinoma was diagnosed, and hepatectomy was performed. Immunostaining resulted in a diagnosis of mucosa-associated lymphoid tissue (MALT) lymphoma of the liver. The patient is currently recurrence-free 9 months postoperatively. MALT lymphoma of the liver is a comparatively rare disease about which much remains unknown, including its etiology and treatment strategy. A case of its resection is presented.

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