A rare case report of endometrial adenosarcoma in the cesarean scar diverticulum.

Background: Endometrial adenosarcoma is an unusual type of uterine tumor that features a seemingly benign epithelial component, paired with a low-grade sarcomatous component, usually similar in appearance to endometrial stromal sarcoma. To our knowledge, no image of endometrial adenocarcinoma in the cesarean scar diverticulum has been reported previously. Case Description: We present a rare case of endometrial adenocarcinoma located in the cesarean scar diverticulum of a 44-year-old patient. The patient was admitted to our hospital complaining of irregular vaginal bleeding that had lasted for over two months. Both B-ultrasound and magnetic resonance imaging confirmed a mass at the junction of the corpus uteri and cervix. After the initial curettage failed to confirm the disease, a hysteroscopy was subsequently performed. Upon further pathological analysis, a diagnosis of endometrial adenosarcoma was confirmed. The patient underwent hysterectomy and salpingo-oophorectomy. The patient was discharged home four days after the surgery and remained recurrence-free for one year after follow-up. Conclusions: Hysteroscopy can serve as a valuable diagnostic tool to identify the lesion in this unique scenario, particularly when curettage fails to diagnose this uncommon condition. We hope that this case would bring awareness of this potential scenario, enabling clinicians in the future to identify similar cases more readily.