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The patient underwent laparotomy and removal of the cystic tumour containing 2.5 L of fluid. Final surgical pathology confirmed FA-LBCL, demonstrating the first case of a retroperitoneal cystic FA-LBCL with biochemical changes mimicking an atypical pheochromocytoma.<\/jats:p>","DOI":"10.1093\/jscr\/rjag057","type":"journal-article","created":{"date-parts":[[2026,2,3]],"date-time":"2026-02-03T12:40:29Z","timestamp":1770122429000},"source":"Crossref","is-referenced-by-count":0,"title":["Case report of a fibrin-associated large B-cell lymphoma presenting as a retroperitoneal cystic tumour mimicking an atypical pheochromocytoma"],"prefix":"10.1093","volume":"2026","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-4217-7093","authenticated-orcid":false,"given":"Y H","family":"Chan","sequence":"first","affiliation":[{"name":"Pamela Youde Nethersole Eastern Hospital ,","place":["Hong Kong SAR"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"K K","family":"Hung","sequence":"additional","affiliation":[{"name":"Pamela Youde Nethersole Eastern Hospital ,","place":["Hong 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