Staging

Stage 1: Limited to the endometrium / myometrium (corpus)
1a: confined to the endometrium
1b: it invades less than half of the myometrium
1c: it invades more than half of the myometrium

Stage 2: Involves the corpus & cervix (but not outside uterus)
2a: involves the endocervical glandular tissue
2b: involves the cervical stromal cells

Stage 3: extended outside uterus but not outside true pelvis
3a: involves the serosa, adnexa, and positive peritoneal cytology
3b: vaginal metastasis
3c: pelvic and/or para-aortic lymph nodes

Stage 4: extended outside true pelvis or bladder mucosa involvement
4a: bladder and rectal mucosa
4b: distant metastasis and/or inguinal lymph nodes