Although the carcinoembryonic antigen (CEA) level in the cyst fluid could not be determined in this case (as only a few drops of the fluid could be aspirated), it may be elevated as was reported in some cases.[9, 17] This finding of thick mucin may be misinterpreted as coming from a mucinous cystic lesion (mucinous cystic neoplasm or Intraductal papillary mucinous neoplasm). The gene discussed is MUC5AC; the disease is cyst.