Primary Retroperitoneal Mucinous Cystadenocarcinoma in a Male Patient: A Case Report. - Tomioka, Masayuki; Nakane, Keita; Iinuma, Koji; Kawase, Kota; Taniguchi, Tomoki; Tobisawa, Yuki; Muto, Aoi; Kanayama, Tomohiro; Miyazaki, Tatsuhiko; Koie, Takuya (Current Oncology, 2025)