An Isthmocele is a scar defect or uterine niche that develops in the myometrium due to an inadequate healing process at the site of the caesarean section incision. The management of isthmocele is not standardized and a correction typically involves invasive procedures (hysteroscopy/resectoscopy, laparoscopy, vaginal surgery). This study is to investigate the effectiveness of the procedures used to treat isthmocele.

Inclusion Criteria:

• Patients undergoing isthmocele correction surgery within the period from 01.01.2017 to 31.12.2020 at the University Hospital Basel, Women's Hospital

Exclusion Criteria:

• Missing information on the preoperative initial situation (preoperative myometrium thickness, lack of imaging via TVUS)
• Missing information on key characteristics that are important in the collection of retrospective data analysis (e.g. data on the previous caesarean section)
• Inability to give an informed consent
• Lack of German language skills

Patients who underwent surgery for isthmocele at the University Hospital Basel between 01.01.2017 and 31.12.2020. Time interval from the operation performed to the study-specific consultation has a maximum of 4 years.