ArticleF&S reports2026
Mature oocyte retrieval without an exogenous trigger during random-start stimulation in a very early intrauterine pregnancy: a case report.
Article in F&S reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Objective: To describe a rare case of mature oocyte retrieval without an exogenous trigger during random-start controlled ovarian stimulation (RS-COS) coinciding with a very early intrauterine pregnancy. Design: Case report. Subject: A 32-year-old para 1 patient with inflammatory breast cancer (grade 3, T4N2M0, ER/PR negative, HER2 3+, Ki-67 60%). Exposure: Luteal-phase RS-COS using a gonadotropin-releasing hormone antagonist protocol with human menopausal gonadotropin (hMG) 300 IU daily. Egg retrieval was performed on day 12 after stimulation. Main Outcome Measures: Number and maturity of oocytes retrieved; occurrence of ovarian hyperstimulation syndrome (OHSS). Results: On day 10 of stimulation, 25 follicles measuring ≥12 mm were seen, of which 18 were in the right ovary. A gestational sac was seen in the uterine cavity. The serum human chorionic gonadotropin level was 2,563 IU/L. Oocyte retrieval from the right ovary was performed without administering a trigger. Nine metaphase II oocytes were retrieved and vitrified; mild clinical OHSS occurred. Conclusion: This case demonstrates that it may be possible to perform COS in early pregnancy and be able to retrieve mature oocytes without the use of an exogenous trigger. To our knowledge, there are no previous published reports of multiple metaphase II oocyte retrieval without an exogenous trigger during RS-COS.
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