Inclusion criteria :  Patients with a history of at least one cesarean section (single or multi-scarred uterus). Age between 18 and 43 years old Secondary infertility requiring ART techniques (FIV or FIV ICSI). A Hysterosonography examination as part of the pre-ART assessment allowing for the detection of the presence of an isthmocele. French speaking patients Patient affiliated to or beneficiary of a social security scheme  Non-inclusion criteria :  - Refusal to participate in the study.