{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T02:25:53Z","timestamp":1792981553538,"version":"4.5.0"},"reference-count":20,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2025,9,5]],"date-time":"2025-09-05T00:00:00Z","timestamp":1757030400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Current Oncology"],"abstract":"<jats:p>Primary retroperitoneal mucinous cystadenocarcinoma (PRMC) is an uncommon malignant neoplasm with few reported cases, particularly among male patients. Currently, only nine documented cases have been reported worldwide, including the present case. The present case report describes the incidental detection of PRMC in an 86-year-old male patient. Despite being offered surgical intervention, the patient initially opted against treatment. Consequently, follow-up imaging examinations were performed for 3 subsequent years. The tumor, initially measuring 31 \u00d7 32 \u00d7 31 mm, gradually increased to 58 \u00d7 60 \u00d7 59 mm. Subsequently, the patient underwent laparoscopic retroperitoneal tumor resection. Histopathological examination revealed adenocarcinoma characterized by intestinal differentiation. The patient has exhibited no evidence of disease for 1 year postoperatively. The present case is noteworthy, as this disease rarely occurs in men, thereby offering significant potential for educational and scientific contributions. Notably, the patient\u2019s age, longitudinal observation of tumor progression through imaging over a period of 3 years, and complete surgical excision of the tumor are salient features of this case. These findings may prove useful in the diagnosis and treatment strategy for male patients with PRMC.<\/jats:p>","DOI":"10.3390\/curroncol32090500","type":"journal-article","created":{"date-parts":[[2025,9,5]],"date-time":"2025-09-05T14:53:01Z","timestamp":1757083981000},"page":"500","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Primary Retroperitoneal Mucinous Cystadenocarcinoma in a Male Patient: A Case Report"],"prefix":"10.3390","volume":"32","author":[{"given":"Masayuki","family":"Tomioka","sequence":"first","affiliation":[{"name":"Department of Urology, Gifu University Graduate School of Medicine, Gifu 5011194, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Keita","family":"Nakane","sequence":"additional","affiliation":[{"name":"Department of Urology, Gifu University Graduate School of Medicine, Gifu 5011194, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Koji","family":"Iinuma","sequence":"additional","affiliation":[{"name":"Department of Urology, Gifu University Graduate School of Medicine, Gifu 5011194, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-8494-5717","authenticated-orcid":false,"given":"Kota","family":"Kawase","sequence":"additional","affiliation":[{"name":"Department of Urology, Gifu University Graduate School of Medicine, Gifu 5011194, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2612-2191","authenticated-orcid":false,"given":"Tomoki","family":"Taniguchi","sequence":"additional","affiliation":[{"name":"Department of Urology, Gifu University Graduate School of Medicine, Gifu 5011194, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8026-9541","authenticated-orcid":false,"given":"Yuki","family":"Tobisawa","sequence":"additional","affiliation":[{"name":"Department of Urology, Gifu University Graduate School of Medicine, Gifu 5011194, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aoi","family":"Muto","sequence":"additional","affiliation":[{"name":"Department of Pathology, Gifu University Hospital, Gifu 5011194, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8845-6827","authenticated-orcid":false,"given":"Tomohiro","family":"Kanayama","sequence":"additional","affiliation":[{"name":"Department of Pathology, Gifu University Hospital, Gifu 5011194, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tatsuhiko","family":"Miyazaki","sequence":"additional","affiliation":[{"name":"Department of Pathology, Gifu University Hospital, Gifu 5011194, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2980-127X","authenticated-orcid":false,"given":"Takuya","family":"Koie","sequence":"additional","affiliation":[{"name":"Department of Urology, Gifu University Graduate School of Medicine, Gifu 5011194, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,9,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"709","DOI":"10.1007\/s00404-015-3975-8","article-title":"Primary retroperitoneal mucinous cystadenocarcinoma (PRMCa): A systematic review of the literature and meta-analysis","volume":"293","author":"Myriokefalitaki","year":"2016","journal-title":"Arch. 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