The definitions of the T categories correspond to the stages accepted by the Fédération Internationale de Gynécologie et d'Obstétrique (FIGO). Both systems are included for comparison. |
Primary tumor (T) |
T category | FIGO stage | T criteria |
TX | | Primary tumor cannot be assessed |
T0 | | No evidence of primary tumor |
T1 | I | Tumor confined to the vagina |
T1a | I | Tumor confined to the vagina, measuring ≤2.0 cm |
T1b | I | Tumor confined to the vagina, measuring >2.0 cm |
T2 | II | Tumor invading paravaginal tissues but not to pelvic sidewall |
T2a | II | Tumor invading paravaginal tissues but not to pelvic wall, measuring ≤2.0 cm |
T2b | II | Tumor invading paravaginal tissues but not to pelvic wall, measuring >2.0 cm |
T3 | III | Tumor extending to the pelvic sidewall* and/or causing hydronephrosis or nonfunctioning kidney |
T4 | IVA | Tumor invading the mucosa of the bladder or rectum and/or extending beyond the true pelvis (bullous edema is not sufficient evidence to classify a tumor as T4) |
* "Pelvic sidewall" is defined as the muscle, fascia, neurovascular structures, or skeletal portions of the bony pelvis. On rectal examination, there is no cancer-free space between the tumor and pelvic sidewall. |
Regional lymph nodes (N) |
N category | FIGO stage | N criteria |
NX | | Regional lymph nodes cannot be assessed |
N0 | | No regional lymph node metastasis |
N0(i+) | | Isolated tumor cells in regional lymph node(s) no greater than 0.2 mm |
N1 | III | Pelvic or inguinal lymph node metastasis |
Distant metastasis (M) |
M category | FIGO stage | M criteria |
M0 | | No distant metastasis |
M1 | IVB | Distant metastasis |
Prognostic stage groups |
When T is... | And N is... | And M is... | Then the stage group is... |
T1a | N0 | M0 | IA |
T1b | N0 | M0 | IB |
T2a | N0 | M0 | IIA |
T2b | N0 | M0 | IIB |
T1-T3 | N1 | M0 | III |
T3 | N0 | M0 | III |
T4 | Any N | M0 | IVA |
Any T | Any N | M1 | IVB |