Twin Peak sign is characteristic of: (A) Dichorionic Diamniotic, (B) Monochorionic Diamniotic, (C) Monochorionic Monoamniotic, (D) Conjoined twins
Answer is A. Determination of ZygositySonographic Determination:ChorionicityDividing inter-twin membrane thicknessSignDichorionicity> 2mmTwin peak sign or Lambda signMonochorionicity< 2mmT signReference: William's Obstetrics; 25th edition; Chapter 45; Multifetal pregnancy