{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,30]],"date-time":"2026-01-30T21:19:34Z","timestamp":1769807974885,"version":"3.49.0"},"reference-count":9,"publisher":"BMJ","issue":"1","license":[{"start":{"date-parts":[[2026,1,30]],"date-time":"2026-01-30T00:00:00Z","timestamp":1769731200000},"content-version":"unspecified","delay-in-days":29,"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":[[2026,1,9]]},"published-print":{"date-parts":[[2026,1]]},"abstract":"<jats:p>Migration of a haemodialysis catheter is an uncommon complication that may compromise dialysis efficacy and patient safety. This report describes a case of haemodialysis catheter tip migration into the azygos vein. A man in his 40s presented with progressive dyspnoea and reduced extracorporeal blood flow during haemodialysis. Chest radiography revealed that both limbs of the left internal jugular tunnelled haemodialysis catheter had migrated to the right brachiocephalic vein and azygos vein, respectively, causing inefficient dialysis. The catheter was successfully repositioned using the modified loop-snare technique, involving a wire loop created with a reverse-curve catheter and goose-neck snare to address the kinked limb. This case underscores the importance of recognising catheter migration and the problem-solving skills of an interventionist. The modified loop-snare technique is an effective, minimally invasive method to reposition migrated haemodialysis catheters, avoiding cuff dissection and a new subcutaneous tunnel creation.<\/jats:p>","DOI":"10.1136\/bcr-2025-267923","type":"journal-article","created":{"date-parts":[[2026,1,30]],"date-time":"2026-01-30T11:25:24Z","timestamp":1769772324000},"page":"e267923","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Imaging features of azygos vein migration of haemodialysis catheter and repositioning using the modified loop-snare technique"],"prefix":"10.1136","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0101-9518","authenticated-orcid":false,"given":"Chun Kei Boris","family":"Chow","sequence":"first","affiliation":[{"name":"Department of Diagnostic and Interventional Radiology, Queen Elizabeth Hospital, Kowloon, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ryo Wan Lung","family":"Yeung","sequence":"additional","affiliation":[{"name":"Department of Diagnostic and Interventional Radiology, Queen Elizabeth Hospital, Kowloon, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-3921-4312","authenticated-orcid":false,"given":"Wai David","family":"Au-Yang","sequence":"additional","affiliation":[{"name":"Department of Medicine, Queen Elizabeth Hospital, Kowloon, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wai Lun","family":"Poon","sequence":"additional","affiliation":[{"name":"Department of Diagnostic and Interventional Radiology, Queen Elizabeth Hospital, Kowloon, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2026,1,30]]},"reference":[{"key":"2026013003251577000_19.1.e267923.1","doi-asserted-by":"publisher","DOI":"10.1186\/s12889-025-21851-z"},{"key":"2026013003251577000_19.1.e267923.2","doi-asserted-by":"crossref","first-page":"474","DOI":"10.1001\/jamainternmed.2023.8232","article-title":"Complication Rates of Central Venous Catheters: A Systematic Review and Meta-Analysis","volume":"184","author":"Teja","year":"2024","journal-title":"JAMA Intern Med"},{"key":"2026013003251577000_19.1.e267923.3","doi-asserted-by":"crossref","first-page":"395","DOI":"10.1053\/j.ajkd.2009.06.041","article-title":"Imaging teaching case. Radiographic features of malpositioning of a hemodialysis catheter in the azygos vein","volume":"55","author":"Pua","year":"2010","journal-title":"Am J Kidney Dis"},{"key":"2026013003251577000_19.1.e267923.4","doi-asserted-by":"crossref","DOI":"10.1016\/j.jvscit.2023.101164","article-title":"Accidental central venous catheter cannulation into aberrant arterial anatomy requiring endovascular intervention","volume":"9","author":"Lucas","year":"2023","journal-title":"J Vasc Surg Cases Innov Tech"},{"key":"2026013003251577000_19.1.e267923.5","first-page":"583","article-title":"Malposition of hemodialysis catheter into the hepatic veins: A case report","volume":"35","author":"Yucel","year":"2019","journal-title":"Pak J Med Sci"},{"key":"2026013003251577000_19.1.e267923.6","unstructured":"Puppala S . Technique: central venous catheter placement. Atlanta: WebMD LLC; 2025. Available: https:\/\/emedicine.medscape.com\/article\/1375734-technique"},{"key":"2026013003251577000_19.1.e267923.7","doi-asserted-by":"crossref","first-page":"8162","DOI":"10.1038\/s41598-020-64985-3","article-title":"Non-invasive tunnelled catheter reposition (NTCR): A simple and safe method to restore central tunnelled catheter function for haemodialysis","volume":"10","author":"Porazko","year":"2020","journal-title":"Sci Rep"},{"key":"2026013003251577000_19.1.e267923.8","doi-asserted-by":"publisher","DOI":"10.1016\/j.jvir.2007.07.002"},{"key":"2026013003251577000_19.1.e267923.9","first-page":"247","article-title":"In situ formation of the loop snare technique for retrieval of foreign bodies from vessels","volume":"1","author":"Wang","year":"2019","journal-title":"J Interv Med"}],"container-title":["BMJ Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bcr-2025-267923","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,1,30]],"date-time":"2026-01-30T11:25:26Z","timestamp":1769772326000},"score":1,"resource":{"primary":{"URL":"https:\/\/casereports.bmj.com\/lookup\/doi\/10.1136\/bcr-2025-267923"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,1]]},"references-count":9,"journal-issue":{"issue":"1","published-online":{"date-parts":[[2026,1,30]]},"published-print":{"date-parts":[[2026,1]]}},"alternative-id":["10.1136\/bcr-2025-267923"],"URL":"https:\/\/doi.org\/10.1136\/bcr-2025-267923","relation":{},"ISSN":["1757-790X"],"issn-type":[{"value":"1757-790X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,1]]}}}