This study is about **endometrial cancer**, which is a type of cancer that starts in the lining of the uterus. Researchers want to see if a special technique called *sentinel lymph node mapping* can help reduce *lymphedema* (swelling in the legs) after a *hysterectomy* (surgery to remove the uterus). In this study, patients will be divided into two groups. One group will have sentinel lymph node mapping, which uses a special dye to find important lymph nodes, and the other will have standard lymph node removal. Both methods aim to check if cancer has spread. - **Length & Visits**: Patients will be followed for up to 2 years, with check-ups every 3 months in the first year, and again at 18 and 24 months. - **Procedures**: Involves ICG dye injection for mapping, possibly removing lymph nodes, and optional blood sample collection. - **Participation**: Participants must be 18+, have stage I endometrial cancer, and be able to understand English or Spanish. This study will help doctors know if this mapping technique is better for preventing leg swelling after surgery.