| Primary tumor (T) |
| T0 |
|
No evidence of primary tumor |
| T1 |
I |
Tumor limited to the ovaries |
| T1a |
IA |
Tumor limited to one ovary; capsule intact, no tumor on ovarian surface; no malignant cells in ascites or peritoneal washings |
| T1b |
IB |
Tumor limited to both ovaries; capsules intact, no tumor on ovarian surface; no malignant cells in ascites or peritoneal washings |
| T1c |
IC |
Tumor limited to one or both ovaries with any of the following: capsule ruptured, tumor on ovarian surface, and malignant cells in ascites or peritoneal washings |
| T2 |
II |
Tumor involves one or both ovaries with pelvic extension |
| T2a |
IIA |
Extension and/or implants on the uterus and/or tube(s); no malignant cells in ascites or peritoneal washings |
| T2b |
IIB |
Extension to and/or implants in other pelvic tissues; no malignant cells in ascites or peritoneal washings |
| T2c |
IIC |
Pelvic extension and/or implants (T2a or T2b) with malignant cells in ascites or peritoneal washings |
| T3 |
III |
Tumor involves one or both ovaries with microscopically confirmed peritoneal metastasis outside the pelvis |
| T3a |
IIIA |
Microscopic peritoneal metastasis beyond the pelvis (no macroscopic tumor) |
| T3b |
IIIB |
Macroscopic peritoneal metastasis beyond the pelvis 2 cm or less in greatest dimension |
| T3c |
IIIC |
Macroscopic peritoneal metastasis beyond the pelvis >2 cm in greatest dimension and/or regional lymph node metastasis |
|
| Regional lymph nodes (N) |
| NX |
|
Regional lymph nodes cannot be assessed |
| N0 |
|
No regional lymph node metastasis |
| N1 |
IIIC |
Regional lymph node metastasis |
|
| Distant metastasis (M) |
| M0 |
|
No distant metastasis |
| M1 |
IV |
Distant metastasis (excludes peritoneal metastasis) |
