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Medical Definition of Placenta circumvallata
1. A cup-shaped placenta with raised edges, having a thick, round, white, opaque ring around its periphery; a portion of the decidua separates the margin of the placenta from its chorionic plate; the remainder of the chorionic surface is normal in appearance, but the foetal vessels are limited in their course across the placenta by the ring. See: placenta marginata, placenta reflexa. (05 Mar 2000)
Lexicographical Neighbors of Placenta Circumvallata
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