Circummarginate Placenta

**Semantic type:** Finding

**Definition:** A placenta characterized by fetal membranes which extend smoothly off the disc edge, and a subamnionic fibrin ring on all or part of the disc perimeter that delimits the greatest extent of the chorionic surface vessels.

**Synonyms:** - Marginal Placenta - Marginal Placenta - Placenta Marginalis - Placenta Marginalis