A rare case of primary retroperitoneal mucinous neoplasm in a male patient

Primary retroperitoneal mucinous neoplasms [cystadenomas, mucinous tumours of borderline malignancy (MTBM) and cystadenocarcinomas] are extremely rare entities almost exclusively affecting women. However, less than 12 cases of primary retroperitoneal mucinous neoplasms (PRMNs), including cystadenomas, MTBMs and cystadenocarcinomas have been reported in males. Here, we present the fifth case of a primary retroperitoneal mucinous neoplasm with borderline malignancy presenting in a male patient in the English literature and, to the best of our knowledge, the first case reported in Australia.