Abstract
A 61-year-old woman was admitted to the hospital because of a cystic mass in the lateral segment of the liver. Examinations revealed a multi-locular cystic lesion with a protruded portion inside. She was diagnosed as having a cystic neoplasm of the liver. Cytology of the cystic fluid revealed no malignant cells. The level of CA19-9 in the cystic fluid was high (32, 263 U/ml) and CEA was normal. Left hepatic lobectomy was performed. Histologically, simple liver cyst was confirmed. At the time of operation, CA19-9 level in the cystic fluid was over 120, 000 U/ml and CEA was 215 ng/ml. Immunological tissue staining proved that CA19-9 and CEA were positive in the epithelial cells of the cyst. It is suggested that tumor markers in the cystic fluid is not always diagnostic for tumorous or malignant lesion.
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