Discordance between chorionicity and embryo transfer number: Four cases report and literature review

Key Points

• Monozygotic twinning appears to be influenced by factors beyond strict fertilization timing, necessitating further exploration.
• In cases with discordance, understanding the implications for embryo transfer practices could improve IVF outcomes.
• Observational analysis of four case reports indicates notable variations in chorionicity linked to embryo transfer numbers.
• The findings suggest a need to revisit guidelines surrounding embryo transfers for better IVF management.