I

Carcinoma confined to the cervix (extension to the uterine corpus should be disregarded)

1. IA

Carcinoma diagnosed only by microscopy, with maximum depth of invasion ≤ 5 mm*

1. IA1

Measured invasion of stroma ≤ 3 mm in depth

1. IA2

Measured invasion of stroma > 3 mm and ≤ 5 mm in depth

1. IB†

Measured deepest invasion of > 5 mm (ie, deeper than stage IA) with lesion limited to the cervix†

1. IB1

Lesion > 5 mm deep and ≤ 2 cm in largest dimension

1. IB2

Lesion > 2 and ≤ 4 cm in largest dimension

1. IB3

Lesion > 4 cm in largest dimension

II

Extension beyond the uterus but not to the pelvic wall or to the lower third of the vagina

1. IIA

Limited to the upper 2/3 of the vagina without parametrial involvement

1. IIA1

Lesion ≤ 4 cm in largest dimension

1. IIA2

Lesion > 4 cm in largest dimension

1. IIB

Parametrial involvement but not up to the pelvic wall

III

Extension to the pelvic wall and/or involves the lower third of the vagina and/or causes hydronephrosis or a nonfunctioning kidney and/or involves pelvic and/or para-aortic lymph nodes

1. IIIA

Extension to lower third of the vagina but not to the pelvic wall

1. IIIB

Extension to the pelvic wall and/or causes hydronephrosis or a nonfunctioning kidney (unless known to be due to another cause)

1. IIIC‡

Involves pelvic and/or para-aortic lymph nodes, regardless of tumor size and extent (with r and p notations)‡

1. IIIC1

Only metastasis to pelvic lymph nodes

1. IIIC2

Metastasis to para-aortic lymph nodes

IV

Extension beyond the true pelvis or biopsy-proven involvement of the bladder or rectal mucosa

1. IVA

Spread to adjacent pelvic organs

1. IVB

Spread to distant organs