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The treatment for limited stage disease is either radiotherapy or active monitoring. The\n                    <jats:sup>18<\/jats:sup>\n                    F-fluorodeoxyglucose positron emission tomography with CT (\n                    <jats:sup>18<\/jats:sup>\n                    F-FDG PET\/CT) is considered the gold standard imaging technique for staging FL. The PET\/CT demonstrated a single avid right inguinal node. The patient received involved-site radiotherapy (24 Gy) to the pelvis and groin followed by four cycles of rituximab and remains under surveillance. There was no metabolically active nodal or extranodal lymphoproliferative disease on follow-up\n                    <jats:sup>18<\/jats:sup>\n                    F-FDG PET\/CT.\n                  <\/jats:p>","DOI":"10.1136\/bcr-2025-267211","type":"journal-article","created":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T05:05:20Z","timestamp":1772255120000},"page":"e267211","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Follicular lymphoma of the urachus"],"prefix":"10.1136","volume":"19","author":[{"given":"Laura","family":"Prieto Matienzo","sequence":"first","affiliation":[{"name":"GU Oncology, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anna","family":"Fischer-Straub","sequence":"additional","affiliation":[{"name":"Pathology, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marlon","family":"Perera","sequence":"additional","affiliation":[{"name":"GU Oncology, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christa","family":"Babst","sequence":"additional","affiliation":[{"name":"GU Oncology, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2026,2,27]]},"reference":[{"key":"2026022721051843000_19.2.e267211.1","doi-asserted-by":"crossref","DOI":"10.1136\/bcr-2021-242315","article-title":"A rare case of urachal adenocarcinoma with bone marrow metastasis","volume":"14","author":"Van Allen","year":"2021","journal-title":"BMJ Case Rep"},{"key":"2026022721051843000_19.2.e267211.2","doi-asserted-by":"crossref","first-page":"253","DOI":"10.1002\/iju5.12599","article-title":"A case of mucosal-associated lymphoid tissue lymphoma of the urachus","volume":"6","author":"Tsuboi","year":"2023","journal-title":"IJU Case Rep"},{"key":"2026022721051843000_19.2.e267211.3","doi-asserted-by":"crossref","DOI":"10.3389\/fonc.2023.1228178","article-title":"Primary urachal leiomyosarcoma: a case report and literature review of clinical, pathological, and medical imaging features","volume":"13","author":"Yan","year":"2023","journal-title":"Front Oncol"},{"key":"2026022721051843000_19.2.e267211.4","doi-asserted-by":"crossref","first-page":"195","DOI":"10.1159\/000515648","article-title":"Urachal Pathology: Review of Cases","volume":"106","author":"Garc\u00eda Garc\u00eda","year":"2022","journal-title":"Urol Int"},{"key":"2026022721051843000_19.2.e267211.5","doi-asserted-by":"crossref","first-page":"655","DOI":"10.21037\/tau.2016.04.01","article-title":"Genetics and biological markers in urachal cancer","volume":"5","author":"Behrendt","year":"2016","journal-title":"Transl Androl Urol"},{"key":"2026022721051843000_19.2.e267211.6","doi-asserted-by":"publisher","DOI":"10.1016\/j.euros.2022.02.009"},{"key":"2026022721051843000_19.2.e267211.7","unstructured":"Kaseb H , Ali MA , Gasalberti DP , et al . 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