PET/MRI in Endometrial Cancer

Inclusion Criteria: * Women aged 18-85 years old with an endometrial biopsy-confirmed diagnosis of either grade 3 endometrioid, serous, carcinosarcoma, undifferentiated or mixed cell carcinoma * Must have presumed stage I disease, i.e., no symptoms suggesting disease outside of the uterus (weight loss, early satiety, bloating, changes in bowel movement, etc.) * Planning to undergo cytoreductive surgery with a Gynecologic oncologist employed by Massachusetts General Hospital * No previous history of chronic severe renal insufficiency and a glomerular filtration rate of \>30 mL/min/1.73m2. If the patient has a history of acute renal failure but their GFR as recovered to above 30, Exclusion Criteria: * Weight greater than 300lbs (the PET/MRI table weight limit) or BMI \> 33 * Subjects less than 18 years of age or greater than 85 years of age * Has Electrical implants, such as cardiac pacemakers or perfusion pumps * Has Ferromagnetic implants such as aneurysm clips, surgical clips, prostheses, artificial hearts, prosthetic heart valves that are not compatible with the gradient maps of our scanners, metal fragments, shrapnel, metallic tattoos anywhere on the body, tattoos near the eye, or steel implants not compatible with a 3 Tesla MR. * Is actively anticipating being pregnant or breastfeeding (a negative STAT quantitative serum hCG pregnancy test is required on the day of the scan before the subject can participate) * Suffers from claustrophobia * If research-related radiatio…