Sonograms of first-trimester twins. A. Dichorionic diamnionic twin pregnancy at 6 weeks’ gestation. Note the thick dividing chorion (yellow arrow). One of the yolk sacs is indicated (blue arrow). B. Monochorionic diamnionic twin pregnancy at 8 weeks’ gestation. Note the thin amnion encircling each embryo, resulting in a thin dividing membrane (blue arrow). |Multifetal Pregnancy. (2017). Obgyn Key. Retrieved 27 August 2017, from https://obgynkey.com/multifetal-pregnancy-2/

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