Endometrial stromal tumours are uncommon tumours that originate from the endometrial stroma and account for approximately 10% of uterine sarcomas and 0.2% of malignancies of the uterus. 1 Currently, the 2020 WHO classification divides endometrial stromal tumours into the following four categories: endometrial stromal nodules (ESNs), low-grade endometrial stromal sarcomas (LG-ESSs), highgrade endometrial stromal sarcomas (HG-ESSs) and undifferentiated uterine sarcomas (UUSs). Most ESSs exhibit a classic low-grade