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Its a placentation abnormality .Placenta got a fetal site .Fetal site which has a central depression is circumvallate placenta
Placenta
"Fetal" refers to anything that relates to a fetus. For example, "fetal tissue" is the tissue of a fetus.
chorion
Fetal surface.
umbilical arteries
It is episitomy
Amniocentesis involves taking a sample of the amniotic fluid and checking the fluid for fetal tissue, metabolites, and other markers that would indicate that there is a problem with fetal development. Fetal genetic testing can be performed on the fetal cells in the amniotic fluid. Chorionic villi sampling essentially involves collecting a specific part of the placenta for genetic analysis. Since the placenta is the same genotype as the fetus it is possible to make a genetic diagnosis of the fetus based on analyzing the placenta. Chorionic villi sampling is less invasive and therefore less likely to cause fetal distress.
The chorion.
Chorionic villus sampling involves the removal of a small amount of tissue directly from the chorionic villi (minute vascular projections of the fetal chorion that combine with maternal uterine tissue to form the placenta).
As in most mammals, the fetal pig will form within the placenta in the uterus of the mother.
placenta