Endometrial biopsy: A technique to collect a tissue sample from your uterine lining for laboratory Investigation. Uterine cancer can also begin during the muscle mass layer of your uterus. This type of uterine cancer is also referred to as uterine sarcoma. This is an unheard of form of uterine cancer. https://www.sgvascularctr.com/a-comprehensive-guide-to-uterine-fibroids-in-singapore/