Gynaecology & Obstetrics Which one of the following congenital malformations of the fetus can be diagnosed earliest in a first trimester ultrasound? A Anencephaly B Prosencephaly C Microcephaly D Meningocele 💡 Explanation Which one of the following congenital malformations of the fetus can be diagnosed earliest in a first trimester ultrasound? ✓ Correct Answer: A. Anencephaly