Table 1: FIGO anatomic staging for gestational trophoblastic neoplasia (GTN).

Stage IDisease confined to the uterus
Stage IIGTN extends outside of the uterus, but is limited to the genital structures (adnexa, vagina, broad ligament)
Stage IIIGTN extends to the lungs, with or without known genital tract involvement
Stage IVAll other metastatic sites

FIGO: International Federation of Gynecology and Obstetrics.