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A, Neutrophils and macrophages in the subchorial space indicating acute subchorionitis (hematoxylin-eosin ×20). B, Increased intervillous fibrin deposit and syncytial knots (hematoxylin-eosin ×10). C, Funisitis and umbilical cord vasculitis (hematoxylin-eosin ×20). D, Funisitis with neutrophil-specific staining (myeloperoxidase immunohistochemistry ×20).
