The 21-year-old mother from the southern province of Tay Ninh became pregnant with dichorionic diamniotic twins through in vitro fertilisation in June 2025. During the first trimester, both fetuses developed normally, and prenatal screening tests showed low risks of abnormalities. At 20 weeks, follow-up ultrasound confirmed that one fetus was developing normally while the other had ceased development. At hospital, doctors confirmed that the non-viable fetus had miscarried, while part of the umbilical cord and the entire placenta remained in the uterus. Despite complications, including an E. coli infection detected during hospitalisation, the medical team managed to extend the pregnancy to 32 weeks.