{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,29]],"date-time":"2025-08-29T00:04:02Z","timestamp":1756425842656,"version":"3.44.0"},"reference-count":21,"publisher":"BMJ","issue":"12","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2022,12,13]]},"published-print":{"date-parts":[[2022,12]]},"abstract":"<jats:p>Endometrial hyperplasia (EH) is a precursor of endometrial cancer. It arises in an environment of unopposed oestrogen. Treatment is based on a combination of weight management, diet and exercise, and the use of progestogens either via a levonogestrel-intrauterine system (LNG-IUS) or orally. The LNG-IUS is the first-line recommendation for EH without atypia. Recurrences are rare, and any recurrences despite prolonged treatment and control of risk factors necessitate a thorough consideration of other oestrogenic sources. This case report presents a rare case of a coexisting ovarian Brenner tumour and ovarian stromal hyperplasia in a menopausal patient in her 50s with recurrent EH despite earlier regression. The above histology may have provided the additional oestrogenic influence. This patient subsequently underwent a definitive hysterectomy and bilateral salpingo-oophorectomy (BSO). It is important to maintain a high index of suspicion for potential oestrogenic influences in cases of refractory EH that are not identifiable on imaging. BSO should be considered at the time of hysterectomy in such cases of unidentified oestrogenic foci.<\/jats:p>","DOI":"10.1136\/bcr-2022-252391","type":"journal-article","created":{"date-parts":[[2022,12,21]],"date-time":"2022-12-21T10:47:55Z","timestamp":1671619675000},"page":"e252391","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Rare case of coexisting ovarian Brenner tumour and ovarian stromal hyperplasia presenting with persistent endometrial hyperplasia following treatment with levonorgestrel-intrauterine system"],"prefix":"10.1136","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8680-8411","authenticated-orcid":false,"given":"Zhun Wei","family":"Mok","sequence":"first","affiliation":[{"name":"Division of Obstetrics and Gynaecology, KK Women's and Children's Hospital, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Janice Pui See","family":"Chin","sequence":"additional","affiliation":[{"name":"Department of Gynaecological Oncology, KK Women's and Children's Hospital, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2022,12,21]]},"reference":[{"key":"2025082803462242000_15.12.e252391.1","unstructured":"Kurman RJ , Carcangiu ML , Herrington CS , et al . 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