“…However, its usefulness is rather limited, since elevated serum levels of CA 19-9 may be encountered in patients with benign disorders with a sensitivity of 77% and a specificity of 88% [4, 5]. Moreover, elevated basal CA 19-9 serum levels have also been described in patients with splenic cysts [6, 7, 8, 9, 10, 11, 12, 13, 14, 15]. This is not surprising, since CA 19-9 is commonly produced by normal human epithelial cells from organs such as pancreas, salivary glands, colon, bronchial glands, endometrium, and biliary tract [16]; moreover, it has been suggested that the epithelium lining splenic cysts may produce this antigen [12, 13, 14, 15].…”