{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T10:50:40Z","timestamp":1782384640107,"version":"3.54.5"},"reference-count":6,"publisher":"Oxford University Press (OUP)","issue":"6","license":[{"start":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T00:00:00Z","timestamp":1782345600000},"content-version":"vor","delay-in-days":25,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,5,31]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Primary umbilical endometriosis (Villar\u2019s nodule) is a rare entity, representing 0.5%\u20131% of all endometriosis cases. We report a 37-year-old multiparous woman presenting with a 7-day history of umbilical pain, swelling, and constipation. Examination revealed a 2\u2009\u00d7\u20092\u00a0cm hyperpigmented, firm, and tender umbilical nodule. The patient described cyclic umbilical pain over 5\u00a0months associated with an irregular menstrual cycle. Trans-abdominal ultrasound suggested an incarcerated umbilical hernia, leading to emergency surgery. Intraoperatively, a small hernial defect containing extraperitoneal fat and a separate subcutaneous nodule were identified without strangulation. Excisional biopsy of the nodule with primary hernia repair was performed. Histopathology demonstrated endometrial glands and stroma within fibroconnective tissue, confirming primary umbilical endometriosis. The postoperative course was uneventful, and the patient remained asymptomatic at 4-month follow-up. This case highlights diagnostic difficulty when umbilical endometriosis presents as a surgical emergency and emphasizes the importance of surgical excision with histopathological confirmation.<\/jats:p>","DOI":"10.1093\/jscr\/rjag395","type":"journal-article","created":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T11:45:17Z","timestamp":1778067917000},"source":"Crossref","is-referenced-by-count":0,"title":["Primary umbilical endometriosis masquerading as strangulated umbilical hernia: a diagnostic pitfall"],"prefix":"10.1093","volume":"2026","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-9492-1648","authenticated-orcid":false,"given":"Syed Saad Ali","family":"Chishti","sequence":"first","affiliation":[{"name":"Beaumont Hospital , Dublin D09V2N0 ,","place":["Ireland"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adam Umair Ashraf","family":"Butt","sequence":"additional","affiliation":[{"name":"Cavan General Hospital , Cavan H12Y7W1 ,","place":["Ireland"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emeka","family":"Nzewi","sequence":"additional","affiliation":[{"name":"Cavan General Hospital , Cavan H12Y7W1 ,","place":["Ireland"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,6,19]]},"reference":[{"key":"2026062506230670500_ref1","doi-asserted-by":"publisher","first-page":"e27626","DOI":"10.7759\/cureus.27626","article-title":"A case of primary endometriosis associated with an umbilical hernia","volume":"14","author":"Odhar","year":"2022","journal-title":"Cureus"},{"key":"2026062506230670500_ref2","doi-asserted-by":"publisher","DOI":"10.52768\/2766-7820\/3191","article-title":"Primary endometriosis mimicking a strangulated umbilical hernia: a case report and review of literature","volume":"5","author":"Aghahowa","year":"2024","journal-title":"J Clin Images Med Case Rep"},{"key":"2026062506230670500_ref3","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1016\/j.ijscr.2016.11.017","article-title":"Spontaneous endometriosis associated with an umbilical hernia: a case report and review of the literature","volume":"30","author":"Ismael","year":"2017","journal-title":"Int J Surg Case Rep"},{"key":"2026062506230670500_ref4","doi-asserted-by":"publisher","first-page":"995","DOI":"10.3390\/jcm11040995","article-title":"Umbilical endometriosis: a systematic literature review and pathogenic theory proposal","volume":"11","author":"Dridi","year":"2022","journal-title":"J Clin Med"},{"key":"2026062506230670500_ref5","doi-asserted-by":"publisher","first-page":"2050313X241246861","DOI":"10.1177\/2050313X241246861","article-title":"A surgical case report on primary umbilical endometriosis (Villar\u2019s nodule)","volume":"12","author":"Benlghazi","year":"2024","journal-title":"SAGE Open Med Case Rep"},{"key":"2026062506230670500_ref6","doi-asserted-by":"publisher","first-page":"107134","DOI":"10.1016\/j.ijscr.2022.107134","article-title":"Primary umbilical endometriosis - case series and review of clinical presentation, diagnosis and management","volume":"94","author":"Bindra","year":"2022","journal-title":"Int J Surg Case Rep"}],"container-title":["Journal of Surgical Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/academic.oup.com\/jscr\/article-pdf\/2026\/6\/rjag395\/68610073\/rjag395.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/academic.oup.com\/jscr\/article-pdf\/2026\/6\/rjag395\/68610073\/rjag395.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T10:23:22Z","timestamp":1782383002000},"score":1,"resource":{"primary":{"URL":"https:\/\/academic.oup.com\/jscr\/article\/doi\/10.1093\/jscr\/rjag395\/8711644"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,5,31]]},"references-count":6,"journal-issue":{"issue":"6","published-print":{"date-parts":[[2026,5,31]]}},"URL":"https:\/\/doi.org\/10.1093\/jscr\/rjag395","relation":{},"ISSN":["2042-8812"],"issn-type":[{"value":"2042-8812","type":"electronic"}],"subject":[],"published-other":{"date-parts":[[2026,6]]},"published":{"date-parts":[[2026,5,31]]},"article-number":"rjag395"}}