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Gross appearance of the formalin-fixed placenta, viewed from the fetal side (A) and the maternal side (B). No macroscopic abnormalities were detected.
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The umbilical cord was inserted centrally (Fig. 1A).
Cross-sectional views of the formalin-fixed placenta. (A and B) Focal infarct was detectable immediately beneath the site of umbilical cord insertion. (C) Cross sections of the umbilical cord depicted no structural abnormalities.
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On the cut surface of the placenta, a white focal infarct was noted beneath the site of the umbilical cord insertion (Fig. 2A). There were small focal infarcts scattered within the marginal area, but these findings are generally not considered abnormal (Fig. 2A and B).  
Histologic images corresponding to the placental infarcts shown in Fig. 2A.
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Microscopy confirmed the presence of focal infarcts, but no massive fibrin depositions were seen (Fig. 3A and B).
Microscopic images of the villous structures. The villi were of appropriate maturity for gestational age and the villous vessels showed no structural abnormalities (A). Histopathology revealed no signs of chorioamnionitis (B) or funisitis (C).
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The placental villi were of appropriate maturity for gestational age and the villous vessels showed no structural abnormalities (Fig. 4A). No signs of chorioamnionitis were detected (Fig. 4B). No signs of funisitis or structural abnormalities were identified in the umbilical cord, which had two arteries and one vein (Fig. 4C).
Immunohistochemistry showing minimal positivity for complement split fraction C4d.
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Using immunohistochemistry, the villi showed minimal immunoreactivity for complement split product C4d (Fig. 5).