1. Parenting
Send to a Friend via Email

Your suggestion is on its way!

An email with a link to:


was emailed to:

Thanks for sharing About.com with others!



Definition: When monozygotic twins are contained in a shared chorion, they are referred to as monochorionic. The chorion is the outer membrane of the sac surrounding a fetus in utero. Monochorionic twins can be either monoamnionic or diamnionic.
Common Misspellings: monochronic, monochorionoc
During a twin pregnancy, it is important to determine the structure of the chorion. Twins that share a are considered monochorionic and may be at risk for complications, such as Twin to Twin Transfusion Syndrome.

©2014 About.com. All rights reserved.