Abstract
We report a rare case of splenic cyst with high serum CA19-9. A 49-year-old woman admitted for high serum CA19-9 of 149.5U/ml, was found in computed tomography to have a splenic cyst (10cm) with some calcification on the wall. Splenectomy was conducted, because of the a tumor. s size, and potential malignancy. The cyst was found histologically to be epidermoidal, and immunohistchemical staining was positive for CA19-9 at in cyst fluid, 12, 782.6U/ml. After surgery, serum CA19-9 returned to normal range.