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We describe the case of a 93-year-old man with stable metastatic prostate cancer who presented with sigmoid obstruction secondary to sigmoid adenocarcinoma. Pathological assessment of the specimen confirmed sigmoid adenocarcinoma as well as prostate cancer deposits in colonic serosa, peritoneum, and mesocolic nodes that was not evident on preoperative imaging. This case highlights a previously undocumented metastatic pattern, the limitations of conventional imaging, and the importance of intra-operative vigilance in dual malignancies.<\/jats:p>","DOI":"10.1093\/jscr\/rjaf1076","type":"journal-article","created":{"date-parts":[[2025,12,23]],"date-time":"2025-12-23T12:46:12Z","timestamp":1766493972000},"source":"Crossref","is-referenced-by-count":0,"title":["Metastatic prostate cancer mimicking colorectal cancer: a rare case of peritoneal and mesocolic lymph node involvement"],"prefix":"10.1093","volume":"2026","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-5260-7712","authenticated-orcid":false,"given":"Aditya","family":"Shiva Rudraiah","sequence":"first","affiliation":[{"name":"Department of Surgery, Liverpool Hospital, Corner of Elizabeth and Goulburn Streets , Liverpool, New South Wales 2170, \u00a0","place":["Australia"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pratik","family":"Raichurkar","sequence":"additional","affiliation":[{"name":"Department of Surgery, Royal Prince Alfred Hospital , 50 Missenden Rd, Camperdown NSW 2050 ,","place":["Australia"]},{"name":"Faculty of Health and Medicine, University of Sydney , The University of Sydney, Science Rd, Camperdown NSW 2050 ,","place":["Australia"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anil","family":"Keshava","sequence":"additional","affiliation":[{"name":"Faculty of Health and Medicine, University of Sydney , The University of Sydney, Science Rd, Camperdown NSW 2050 ,","place":["Australia"]},{"name":"Division of Colorectal Surgery, Department of Surgery, Concord Repatriation General Hospital , Hospital Rd, Concord NSW 2139 ,","place":["Australia"]},{"name":"Faculty Medicine, Health and Human Sciences , Macquarie University, Suite 305, Level 3\/2 Technology Pl, Macquarie Park 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