{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,22]],"date-time":"2026-07-22T15:02:29Z","timestamp":1784732549011,"version":"3.55.0"},"reference-count":17,"publisher":"BMJ","issue":"7","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2026,7,9]]},"published-print":{"date-parts":[[2026,7]]},"abstract":"<jats:p>Hydatid disease uncommonly involves the kidney and is particularly rare in children. We report a paediatric case of isolated renal hydatid cyst that radiologically appeared as a Bosniak II simple cortical cyst without classical signs such as daughter cysts, calcification or membrane detachment. Preoperative diagnosis favoured a benign renal cyst and serology was unavailable, resulting in hydatid disease being identified intraoperatively following cyst aspiration and visualisation of membranes. Nephron-sparing cystectomy was performed using controlled anti-spillage technique with povidone\u2013iodine irrigation and perioperative albendazole therapy. Histopathology confirmed echinococcal infection. This case highlights the diagnostic challenge of imaging-negative renal hydatid disease and demonstrates the feasibility of nephron-sparing surgery in children. Isolated renal hydatid disease may mimic benign cystic lesions in paediatric practice and require intraoperative recognition to avoid complications and preserve renal function.<\/jats:p>","DOI":"10.1136\/bcr-2026-272725","type":"journal-article","created":{"date-parts":[[2026,7,22]],"date-time":"2026-07-22T14:20:25Z","timestamp":1784730025000},"page":"e272725","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Imaging-negative renal hydatid disease diagnosed intraoperatively during nephron-sparing surgery"],"prefix":"10.1136","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5606-4255","authenticated-orcid":false,"given":"Rupesh","family":"Keshri","sequence":"first","affiliation":[{"name":"Department of Pediatric Surgery, All India Institute of Medical Sciences, Deoghar, Jharkhand, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9620-9305","authenticated-orcid":false,"given":"Sandip Kumar","family":"Rahul","sequence":"additional","affiliation":[{"name":"Department of Pediatric Surgery, All India Institute of Medical Sciences, Deoghar, Jharkhand, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vikash","family":"Bansal","sequence":"additional","affiliation":[{"name":"Department of Anaesthesiology, All India Institute of Medical Sciences, Deoghar, Jharkhand, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pradosh Kumar","family":"Sarangi","sequence":"additional","affiliation":[{"name":"Radiodiagnosis, All India Institute of Medical Sciences, Deoghar, Jharkhand, India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2026,7,22]]},"reference":[{"key":"2026072207201710000_19.7.e272725.1","doi-asserted-by":"publisher","DOI":"10.1148\/radiographics.20.3.g00ma06795"},{"key":"2026072207201710000_19.7.e272725.2","article-title":"Isolated renal hydatid cyst in a ten-year-old female child: A rare case report","volume":"50","author":"Hailu","year":"2023","journal-title":"Urol Case Rep"},{"key":"2026072207201710000_19.7.e272725.3","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1186\/s12301-021-00176-4","article-title":"Isolated renal hydatid cyst misdiagnosed and treated as a cystic renal tumor: a diagnostic pitfall","volume":"27","author":"Hamdani","year":"2021","journal-title":"Afr J Urol"},{"key":"2026072207201710000_19.7.e272725.4","first-page":"776","article-title":"Primary hydatid cyst of the kidney: diagnosis and treatment","volume":"4","author":"El Ammari","year":"2013","journal-title":"Int J Surg Case Rep"},{"key":"2026072207201710000_19.7.e272725.5","doi-asserted-by":"publisher","DOI":"10.1016\/bs.apar.2016.09.006"},{"key":"2026072207201710000_19.7.e272725.6","first-page":"178","article-title":"Isolated renal hydatid cyst in a child: a rare case report","volume":"22","author":"Karim","year":"2017","journal-title":"J Indian Assoc Pediatr Surg"},{"key":"2026072207201710000_19.7.e272725.7","first-page":"403","article-title":"Primary renal hydatid cyst: diagnosis and treatment","volume":"18","author":"Bedioui","year":"2008","journal-title":"Prog Urol"},{"key":"2026072207201710000_19.7.e272725.8","article-title":"Hydatiduria as a rare presentation of renal hydatid cyst","volume":"71","author":"Arnulf","year":"2008","journal-title":"Urology"},{"key":"2026072207201710000_19.7.e272725.9","article-title":"Renal Hydatid Cyst or a Simple Cyst? 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