Key laboratory findings are summarised in Table 1, which demonstrates an exudative ascitic profile, while tumour marker alpha-fetoprotein (AFP), carbohydrate antigen 19-9 (CA19-9), and carcinoembryonic antigen (CEA) were within normal limits. Magnetic resonance cholangiopancreatography (MRCP) showed a stable uncinate IPMN without suspicious features, low-volume free fluid, and otherwise unremarkable abdominal viscera, including the liver, gallbladder, adrenal glands, and kidneys. This evidence concerns the gene CEACAM5 and neoplasm.