Which sonographic sign is suggested to determine chorionicity in first trimester?
Lambda or twin peak sign
What sign of amnionicity is seen in the images? Why not its a monoamniotic monochorionic twin pregnancy?
Thin intertwin membrane is seen, and two yolk sacs are seen. Monochorionic monoamniotic pregnancy will have single yolk sac, and no intertwin membrane.
Single gastational sac
Two yolk sac
Two fetal poles ( 2 mm ) with Cardiac activity