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Diamniotic Monochorionic Twin Membranes
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19 weeks a b b
  Diamniotic monochorionic twins with single posterior placenta. Note thin dividing membrane (arrow) characteristic of monochoricity. Non-presenting twin is anencephalic, demonstrating the finding of discordant anomalies in chromasomally identical fetus.
21 weeks a b b
  Diamniotic monochorionic twins with demise of non-presenting twin. Membrane (arrow) is closely adherent to demised "stuck" twin.
22 weeks b    
  Diamniotic monochorionic twins demonstrating twin embolization syndrome with demise of one twin and porencephaly and ventriculmegaly of the remaining twin.    
24 weeks a a b
Normal diamniotic monochorionic twins. Thin dividing membrane (arrow), single placenta, and same gender of twins are consistent with monochoricity.