Table 17-3. FIGO staging of cancer of the cervix

Preinvasive carcinoma

Stage 0

• Carcinoma in situ

Invasive carcinoma

Stage I

• Carcinoma strictly confined to the cervix.

IA

• Invasive cancer diagnosed only by microscopy.
  All gross lesions, even with superficial invasion, are stage IB.
  IA1 Measured invasion of stroma no greater than 3 mm in depth and no wider than 7 mm.
  IA2 Measured invasion of stroma greater than 3 mm in depth and no greater than 5 mm in depth and no wider than 7 mm.
  

IB

• Clinical lesions confined to the cervix or preclinical lesions greater than 1A.
    IB1 Clinical lesions no greater than 4 cm.
  IB2 Clinical lesions greater than 4 cm.
  

Stage II

• Carcinoma extends beyond the cervix but has not extended to the pelvic wall. The carcinoma involves the vagina but not as far as the lower third.

IIA

• No obvious parametrial involvement.

IIB

• Obvious parametrial involvement.

Stage III

• Carcinoma has extended either to the lower third of the vagina or to the pelvic sidewall. All cases of hydronephrosis.

IIIA

• Involvement of lower third of vagina. No extension to pelvic sidewall.

IIIB

• Extension onto the pelvic wall and/or hydronephrosis or nonfunctioning kidney.

Stage IV

• Carcinoma extended beyond the true pelvis or clinically involving the mucosa of the bladder or rectum.

IVA

• Spread of growth to adjacent organs.

IVB

• Spread of growth to distant organs.