{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,3]],"date-time":"2026-05-03T00:48:34Z","timestamp":1777769314673,"version":"3.51.4"},"reference-count":33,"publisher":"BMJ","issue":"4","license":[{"start":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T00:00:00Z","timestamp":1777420800000},"content-version":"unspecified","delay-in-days":28,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2026,4,1]]},"published-print":{"date-parts":[[2026,4]]},"abstract":"<jats:p>The increased use of imaging has led to more frequent detection of small renal masses (SRMs), often prompting percutaneous renal mass biopsy (RMB) to guide management. While generally safe, RMB carries rare risks, including tumour seeding. We present a case of a 29 mm papillary renal cell carcinoma in a man in his 50s, where tumour seeding into the perinephric fat was identified along the biopsy tract following partial nephrectomy. This was associated with pathological upstaging and contributed to a decision for more intensive postoperative surveillance at the discretion of the multidisciplinary meeting. The case underscores the importance of careful patient selection for RMB, particularly in surgically amenable SRMs, where the risk of tumour seeding should be carefully considered.<\/jats:p>","DOI":"10.1136\/bcr-2025-270464","type":"journal-article","created":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T16:15:35Z","timestamp":1777479335000},"page":"e270464","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Tumour seeding and upstaging in papillary renal cell carcinoma: an uncommon complication of renal mass biopsy"],"prefix":"10.1136","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-2702-6669","authenticated-orcid":false,"given":"Emma","family":"Powell","sequence":"first","affiliation":[{"name":"Urology, Sir Charles Gairdner Hospital, Nedlands, Western Australia, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter","family":"Lawlor","sequence":"additional","affiliation":[{"name":"Royal Perth Hospital Wellington Street Campus, Perth, Western Australia, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Justin","family":"Vivian","sequence":"additional","affiliation":[{"name":"Urology, Sir Charles Gairdner Hospital, Nedlands, Western Australia, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2026,4,29]]},"reference":[{"key":"2026042909151633000_19.4.e270464.1","doi-asserted-by":"publisher","DOI":"10.2214\/AJR.10.5920"},{"key":"2026042909151633000_19.4.e270464.2","doi-asserted-by":"publisher","DOI":"10.1097\/JU.0000000000001911"},{"key":"2026042909151633000_19.4.e270464.3","doi-asserted-by":"crossref","DOI":"10.1155\/2017\/1854027","article-title":"Imaging and Management of Incidental Renal Lesions","volume":"2017","author":"Mazziotti","year":"2017","journal-title":"Biomed Res Int"},{"key":"2026042909151633000_19.4.e270464.4","doi-asserted-by":"crossref","first-page":"403","DOI":"10.1016\/j.eururo.2016.04.001","article-title":"Renal Mass Biopsy: Always, Sometimes, or Never?","volume":"70","author":"Kutikov","year":"2016","journal-title":"Eur Urol"},{"key":"2026042909151633000_19.4.e270464.5","doi-asserted-by":"crossref","first-page":"1007","DOI":"10.1016\/j.eururo.2015.04.004","article-title":"Renal Tumor Biopsy for Small Renal Masses: A Single-center 13-year Experience","volume":"68","author":"Richard","year":"2015","journal-title":"Eur Urol"},{"key":"2026042909151633000_19.4.e270464.6","doi-asserted-by":"publisher","DOI":"10.1200\/JCO.2014.56.5416"},{"key":"2026042909151633000_19.4.e270464.7","doi-asserted-by":"publisher","DOI":"10.1016\/j.juro.2017.04.100"},{"key":"2026042909151633000_19.4.e270464.8","doi-asserted-by":"publisher","DOI":"10.1016\/j.juro.2007.03.131"},{"key":"2026042909151633000_19.4.e270464.9","first-page":"254","article-title":"The current role of percutaneous biopsy in the evaluation of renal masses","volume":"13","author":"Herts","year":"1995","journal-title":"Semin Urol Oncol"},{"key":"2026042909151633000_19.4.e270464.10","doi-asserted-by":"crossref","first-page":"951","DOI":"10.1111\/his.14309","article-title":"To stage or not to stage: determining the true clinical significance of the biopsy tract through perinephric fat in assessing renal cell carcinoma","volume":"78","author":"Valencia-Guerrero","year":"2021","journal-title":"Histopathology"},{"key":"2026042909151633000_19.4.e270464.11","doi-asserted-by":"crossref","first-page":"358","DOI":"10.1177\/2051415819841956","article-title":"Tumour seeding of a renal mass biopsy tract: more common than thought?","volume":"15","author":"Heywood","year":"2022","journal-title":"J Clin Urol"},{"key":"2026042909151633000_19.4.e270464.12","doi-asserted-by":"crossref","unstructured":"Staehler M , Graser A , Rath L , et al . 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