Inclusion Criteria:  Patients proved to have endometrial cancer by curettage or hysteroscopy. Patients accepted surgery treatment, without anti-tumor and hormone therapy before surgery. Ability to stay still for the duration of the PET/CT scan (~15 minutes). Ability of the patient (or his/her guardian) to sign informed consent.  Exclusion Criteria:  Patients who recieved neoadjuvant therapy before PET/CT. Patients with tumors other than endometrial cancer. Pregnancy. Inability to give informed consent. Inability to stay still for the duration of the scan. Claustrophobia