Cesarean scar defect - uterine cavity fluid is a major concern recently. In recent years, the rate of cesarean section has increased due to professional factors and additional social factors. Cesarean scar defect is a phenomenon recorded 1-2 years late and can be 10 years after cesarean section, due to poor scar recovery in the uterine isthmus. This can be considered one of the causes of secondary infertility.