[4] Benign cystadenomas are the most common cystic tumors of the pancreas accounting for 75% of the cases.

[6] Biliary cystadenoma and cystadenocarcinoma constitute less than 5% of intrahepatic cysts originating from the bile duct.

[6] Cystadenomas in liver are often confused with hydatid cyst as their appearance on various imaging techniques is nearly same.

[7] Cases of primary retroperitoneal mucinous cystadenoma (PRMC) are extremely rare.

[8] Even though mucinous cystadenoma are common ovarian tumor, what makes PRMC so rare is their retroperitoneal location.

Both are multiloculated cystic neoplasms and are lined by a single layer of tall columnar cells with a clear basal nucleus and cytoplasm.