Prenatal Ultrasonic Diagnosis of Persistent Right Umbilical Vein with Single Umbilical Artery in Twin Pregnancy: A Case Report. - GAUR, SHUBHI; PARIHAR, PRATAP SINGH; DHAWAN, VAISHALI; NIMODIA, DEVYANSH; DESALE, PRASAD SANJAY (Journal of Clinical & Diagnostic Research, 2025)