In this study, there was a poor agreement between the diagnosis of mucinous cysts in EUS with a cyst fluid CEA level higher than 192 ng/mL and a moderate agreement between the diagnosis of SCN with a CEA level less than 5 ng/mL.16 So, a more accurate algorithm is needed to reduce various errors and improve the sensitivity in identifying malignant cysts.26 This evidence concerns the gene CEACAM5 and cyst.