Abstract
A 74-year-old woman was admitted to our hospital for treatment of rectosigmoid colon cancer. Abdominal CT showed two hypovascular tumors, one, 10 mm in diameter, was located in segment 8 and the other, 5 mm in diameter, was located at segments 6 to 7 of the liver. These tumors were not detected on abdominal ultrasonography. Synchronous metastatic tumors of colon cancer were diagnosed. Thus surgery was performed. These tumors were not detected on operative ultrasonography. However, a tumor was palpated in segment 8, and a limited resection which included the lesion was performed. On pathohistology, the colon lesion was found to be a well differentiated adenocarcinoma with a metastatic lymph node, and the liver tumor was a nodule of aggregated lymphocytes that formed a lymphoepithelial lesion. On immunohistochemistry, lymphoma cells were positive for CD20 and CD5, but negative for CD10. Therefore, a hepatic lymphoma of mucosa-associated lymphoid tissue (MALT) was diagnosed. A primary hepatic MALT lymphoma is rare. It is important to differentiate this entity from metastatic hepatic tumors in patients with carcinoma in other organs.
