Endometrial cancer is a cancer that starts in the uterus. The uterus is a hollow pear-shaped pelvic organ where fetal development occurs.
Endometrial cancer begins in the layer of cells that form the endometrium (endometrium). Endometrial cancer is sometimes called uterine cancer. Other types of cancers can also form in the uterus, including uterine sarcomas, but they are much less common than endometrial cancers.