Characteristics of acute placental inflammatory responses (Amsterdam criteria30)
| Acute inflammatory response | |
| Maternal response | Fetal response |
| Acute deciduitis | Acute umbilical phlebitis and/ or arteritis |
| Acute subchorionitis | Chorionic vasculitis |
| Acute chorioamnionitis | Acute chorionitis |
| Acute severe/necrotising chorioamnionitis | Acute funisitis (Wharton’s jelly) |
| Neutrophilic infiltration | |