Table 37.3. FIGO staging of cervical cancer

Table 37.3. FIGO staging of cervical cancer.
Designation	Definition
Stage 0	Carcinoma in situ
Stage I	Cancer confined to the cervix (corpus extension is disregarded)
IA	Preclinical cancer, i.e., diagnosed by microscopy only
IA₁	Measured depth of stromal invasion no greater than 3.0 mm
IA₂	Microscopically measurable lesion with depth of invasion <5 mm and horizontal spread <7 mm
IB	Clinical lesions confined to the cervix or preclinical lesions greater than stage IA₂
IB₁	Clinical lesions no greater than 4.0 cm in size
IB₂	Clinical lesions greater than 4.0 cm in size
Stage II	Parametrial extension, but not to the sidewall; involvement of the upper two-thirds of the vagina
IIA	No evidence of parametrial involvement
IIB	Obvious parametrial extension
Stage III	Extension of cancer to the pelvic sidewall or lower one-third of the vagina; hydronephrosis or nonfunctioning kidney secondary to cancer
IIIA	No pelvic sidewall extension
IIIB	Extension to the sidewall and/or hydronephrosis or nonfunctioning kidney
Stage IV	Spread beyond the reproductive tract
IVA	Infiltration of bladder or rectal mucosa
IVB	Metastases to distant organs or disease outside the true pelvis