- Mucinous cystic neoplasms : either Intraductal Papillary Mucinous Neoplasm (IPMN) or mucinous cystadenomas/mucinous cystadenocarcinoma(MCN) Mucinous cystic neoplasms are considered to be malignant or pre-malignant and are considered for surgical resection, whereas pseudocysts and serous cysts are considered benign and with a low potential for malignancy. Pseudocysts and serous cysts are usually only considered for surgical resection when symptomatic or enlarging.