Gynaecology & Obstetrics Which of the following feature on second trimester ultrasound is not a marker of Down’s syndrome: A Single umbilical aery B Choroids plexus cyst C Polycystic kidneys D Duodenal atresia 💡 Explanation Which of the following feature on second trimester ultrasound is not a marker of Down's syndrome: ✓ Correct Answer: C. Polycystic kidneys