{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,31]],"date-time":"2025-10-31T07:42:48Z","timestamp":1761896568812,"version":"3.44.0"},"reference-count":7,"publisher":"BMJ","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Reports"],"accepted":{"date-parts":[[2017,5,25]]},"abstract":"<jats:p>A duplex ureter constitutes about 1% of the renal tract anomalies.<\/jats:p>\n               <jats:p>A 39-year-old man presented with a 4-week history of left loin pain and microscopic haematuria. Investigation with a non-contrast CT KUB revealed a 6\u2009mm non-obstructing calculus in the left distal ureter.<\/jats:p>\n               <jats:p>Left ureteroscopy and lithotripsy was planned. However, ureteroscopy failed to identify the calculus. A double J ureteric stent was left in situ and the procedure abandoned in favour of further assessment with a CT urogram. Imaging surprisingly showed a left duplex ureter with the calculus in the non-stented ureter.<\/jats:p>\n               <jats:p>Repeat ureteroscopy noted the second ureter opening within the distal intramural part of the stented ureter. The calculus was identified and laser lithotripsy performed. A double J stent was appropriately reinserted and removed 2 weeks later.<\/jats:p>\n               <jats:p>Our case highlights the importance of contrasted imaging prior to performing ureteroscopy for calculus disease.<\/jats:p>","DOI":"10.1136\/bcr-2017-220198","type":"journal-article","created":{"date-parts":[[2017,6,13]],"date-time":"2017-06-13T03:30:19Z","timestamp":1497324619000},"page":"bcr-2017-220198","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":5,"title":["Pitfalls of the duplex system: the mystery of the missing stone"],"prefix":"10.1136","volume":"2017","author":[{"given":"Donald Kudakwashe","family":"Nyanhongo","sequence":"first","affiliation":[{"name":"Walsall Manor Hospital, Walsall, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Satpal","family":"Antil","sequence":"additional","affiliation":[{"name":"Walsall Manor Hospital, Walsall, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Syed","family":"Nasir","sequence":"additional","affiliation":[{"name":"Walsall Manor Hospital, Walsall, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2017,6,13]]},"reference":[{"key":"2025082707444626000_2017.jun12_1.bcr-2017-220198.1","unstructured":"Gatti J , Cendron M , Murphy P , et al . Ureteral Duplication, Ureteral Ecto-pia, and Ureterocele: Background, Pathophysiology, Epidemiology. 2017 http:\/\/emedicine.medscape.com\/article\/1017202-overview#a6"},{"key":"2025082707444626000_2017.jun12_1.bcr-2017-220198.2","doi-asserted-by":"crossref","first-page":"109","DOI":"10.1148\/radiographics.17.1.9017803","article-title":"Ureteral duplication and its complications","volume":"17","author":"Fernbach","year":"1997","journal-title":"Radiographics"},{"key":"2025082707444626000_2017.jun12_1.bcr-2017-220198.3","unstructured":"Webster Sde-Wreede R . Embryology at a Glance, 2nd Edition. 1st ed: BMJ Publishing Group, 2016."},{"key":"2025082707444626000_2017.jun12_1.bcr-2017-220198.4","unstructured":"Mitchell B , Sharma R , Britton R . Embryology. 1st ed. Edinburgh: BMJ Publishing Group, 2010."},{"key":"2025082707444626000_2017.jun12_1.bcr-2017-220198.5","doi-asserted-by":"publisher","DOI":"10.1177\/2051415815595180"},{"key":"2025082707444626000_2017.jun12_1.bcr-2017-220198.6","doi-asserted-by":"crossref","first-page":"23","DOI":"10.1016\/j.ijscr.2014.11.049","article-title":"Bilateral complete ureteral duplication with calculi obstructing both limbs of left double ureter","volume":"6C","author":"Aiken","year":"2015","journal-title":"Int J Surg Case Rep"},{"key":"2025082707444626000_2017.jun12_1.bcr-2017-220198.7","unstructured":"T\u00fcrk C , Knoll T , Petrik A , et al . Urolithiasis. Eur Urol 2017 https:\/\/uroweb.org\/guideline\/urolithiasis\/#3"}],"container-title":["BMJ Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bcr-2017-220198","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,8,27]],"date-time":"2025-08-27T14:44:54Z","timestamp":1756305894000},"score":1,"resource":{"primary":{"URL":"https:\/\/casereports.bmj.com\/lookup\/doi\/10.1136\/bcr-2017-220198"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2017,6,13]]},"references-count":7,"alternative-id":["10.1136\/bcr-2017-220198"],"URL":"https:\/\/doi.org\/10.1136\/bcr-2017-220198","relation":{},"ISSN":["1757-790X"],"issn-type":[{"type":"electronic","value":"1757-790X"}],"subject":[],"published":{"date-parts":[[2017,6,13]]}}}