In chronic abruption, hemosiderinladen macrophages are visible in membranes and chorionic plate
. Thrombi can be red in acute but in chronic cases these are pale tan to white with well demarcated parenchymal lesions.
The cotyledons that are visible on the maternal surface of the placenta show a good correspondence to the position of the villous trees derived from the chorionic plate
in the intervillous space or blood chamber (Huppertz; Prieto Gomez et al., 2008; Carlson).
Pseudovillous trophoblastic proliferation present at the undersurface of the chorionic plate
[(a) magnification x100, H&E], highlighted by double E-cadherin (brown)/CD34 (red) immunostain [(b) magnification x400].
Thrombi and intramural fibrin are most common in chorionic plate
surface veins and in major villous stem vessels.
Acute features, and normal CG vasculitis of chorionic plate
. Acute chorioamnionitis.
Thus, the morphological study of placentas from 22 women with genital infection being in preterm labor in term of 30-36 weeks indicates severe disorders of uterus and placental circulation as well as severe degenerative changes in all structural components of the placenta due to inflammatory infiltration of decidua and chorionic plate
If the transmural thickness is greater than the length of the cassette, two options are available: the upper third (chorionic plate
and subjacent tissue) and lower third (basal aspect) of the parenchyma can be submitted in one cassette, or the gross slice can be divided into two and submitted in two cassettes (ie, a fifth block may be required; Figure 4).
Mothers with hypertension and anemia were associated with growth restriction of placental weight and chorionic plate
The 3-D display enables visualization of placental changes, including calcifications, placental "lakes," indentations of the chorionic plate
, and changes in gray-scale echogenicity.
Placenta is an organ of dual origin: chorionic plate
derived from the developing embryo and decidual plate derived from modification of the uterine lining of the mother.
The stem (anchoring) villi form as outgrowths of the chorionic plate
early in placentogenesis and give rise to the branching villous trees (Figure 1).