Inclusion Criteria:  All patients who have given birth by cesarean section at the maternity University Hospital Saint Etienne and all underwent a placenta pathological examination at the Saint Etienne University Hospital. For the pre-eclampsia group: patient with a diagnosis of pre-eclampsia For the control group: patient who had a normal pregnancy  Exclusion Criteria:  Patient who gave birth naturally Underage patients or under guardianship Patients who do not speak or read French Childbirth under X