Cervical Cancer Staging

Stage I – Confined to the Cervix

Stage	Description
IA1	Invasion ≤3 mm depth and ≤7 mm width (microscopic)
IA2	Invasion >3 mm and ≤5 mm depth, ≤7 mm width
IB1	Tumor >5 mm deep, ≤2 cm
IB2	Tumor >2 cm and ≤4 cm
IB3	Tumor >4 cm

Stage II – Beyond Cervix, Not to Pelvic Wall

IIA1	Upper 2/3 vagina involved, ≤4 cm, no parametria
IIA2	Upper 2/3 vagina, >4 cm
IIB	Parametrial invasion (not to pelvic wall)

Stage III – To Pelvic Wall, Lower Vagina, or Lymph Nodes

IIIA	Involves lower third of vagina
IIIB	Pelvic wall involvement and/or hydronephrosis
IIIC1	Pelvic lymph node metastasis
IIIC2	Para-aortic lymph node metastasis

Note: Stage IIIC should be specified with "r" (radiologic) or "p" (pathologic), e.g., IIIC1p or IIIC2r.

Stage IV – Invasion of Adjacent Organs or Distant Spread

IVA	Invasion into bladder or rectum
IVB	Distant metastasis (lungs, liver, bones)

Clinical Notes

• Staging includes findings from imaging (MRI, PET-CT) and pathology.
• Lymph node involvement upgrades staging to IIIC.
• FIGO recommends combining imaging and clinical examination.