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She had a successful frozen blastocyst embryo transfer. The patient\u2019s 7-week ultrasound demonstrated a single gestational sac, yolk sac and fetal pole. However, the crown-rump length appeared visually abnormal and two heartbeats were visualised. She was referred to maternal\u2013fetal medicine (MFM) for a first-trimester ultrasound. Her ultrasound with MFM was notable for a fluid-filled chest, foreshortened limbs and early sacral agenesis. She was subsequently diagnosed with cephalopagus twins and underwent an induced abortion following consultation with MFM.<\/jats:p>","DOI":"10.1136\/bcr-2024-260336","type":"journal-article","created":{"date-parts":[[2024,7,8]],"date-time":"2024-07-08T19:30:10Z","timestamp":1720467010000},"page":"e260336","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":2,"title":["Cephalopagus twins diagnosed at 7 weeks gestational age following IVF\/ICSI"],"prefix":"10.1136","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-9236-6873","authenticated-orcid":false,"given":"David","family":"Boedeker","sequence":"first","affiliation":[{"name":"Gynecologic Surgery and Obstetrics, Walter Reed National Military Medical Center, Bethesda, Maryland, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marja","family":"Brolinson","sequence":"additional","affiliation":[{"name":"National Institutes of Health, Bethesda, Maryland, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Krista","family":"Mehlhaff","sequence":"additional","affiliation":[{"name":"University of Maryland School of Medicine, Baltimore, MA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Micah","family":"Hill","sequence":"additional","affiliation":[{"name":"Gynecologic Surgery and Obstetrics, Walter Reed National Military Medical Center, Bethesda, Maryland, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Trimble","family":"Spitzer","sequence":"additional","affiliation":[{"name":"Uniformed Services University, Bethesda, Maryland, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2024,7,8]]},"reference":[{"key":"2025082713265168000_17.7.e260336.1","doi-asserted-by":"publisher","DOI":"10.6061\/clinics\/2013(03)OA14"},{"key":"2025082713265168000_17.7.e260336.2","unstructured":"Charles J , Lockwood AO . 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