Version May 2024
| Primary tumor (T) | |||
| T category | FIGO stage | T criteria | |
| TX | Primary tumor cannot be assessed | ||
| T0 | No evidence of primary tumor | ||
| T1 | I | Tumor limited to ovaries (one or both) or fallopian tube(s) | |
| T1a | IA | Tumor limited to one ovary (capsule intact) or fallopian tube, no tumor on ovarian or fallopian tube surface; no malignant cells in ascites or peritoneal washings | |
| T1b | IB | Tumor limited to both ovaries (capsules intact) or fallopian tubes; no tumor on ovarian or fallopian tube surface; no malignant cells in ascites or peritoneal washings | |
| T1c | IC | Tumor limited to one or both ovaries or fallopian tubes, with any of the following: | |
| T1c1 | IC1 |
| |
| T1c2 | IC2 |
| |
| T1c3 | IC3 |
| |
| T2 | II | Tumor involves one or both ovaries or fallopian tubes with pelvic extension below pelvic brim or primary peritoneal cancer | |
| T2a | IIA | Extension and/or implants on the uterus and/or fallopian tube(s) and/or ovaries | |
| T2b | IIB | Extension to and/or implants on other pelvic tissues | |
| T3 | III | Tumor involves one or both ovaries or fallopian tubes, or primary peritoneal cancer, with microscopically confirmed peritoneal metastasis outside the pelvis and/or metastasis to the retroperitoneal (pelvic and/or para-aortic) lymph nodes | |
| T3a | IIIA2 | Microscopic extrapelvic (above the pelvic brim) peritoneal involvement with or without positive retroperitoneal lymph nodes | |
| T3b | IIIB | Macroscopic peritoneal metastasis beyond pelvis 2 cm or less in greatest dimension with or without metastasis to the retroperitoneal lymph nodes | |
| T3c | IIIC | Macroscopic peritoneal metastasis beyond the pelvis more than 2 cm in greatest dimension with or without metastasis to the retroperitoneal lymph nodes (includes extension of tumor to capsule of liver and spleen without parenchymal involvement of either organ) | |
| 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 | IIIA1 | Positive retroperitoneal lymph nodes only (histologically confirmed) | |
| N1a | IIIA1i | Metastasis up to and including 10 mm in greatest dimension | |
| N1b | IIIA1ii | Metastasis more than 10 mm in greatest dimension | |
| Distant metastasis (M) | |||
| M category | FIGO stage | M criteria | |
| M0 | No distant metastasis | ||
| M1 | IV | Distant metastasis, including pleural effusion with positive cytology; liver or splenic parenchymal metastasis; metastasis to extra-abdominal organs (including inguinal lymph nodes and lymph nodes outside the abdominal cavity); and transmural involvement of intestine | |
| M1a | IVA | Pleural effusion with positive cytology | |
| M1b | IVB | Liver or splenic parenchymal metastases; metastases to extra-abdominal organs (including inguinal lymph nodes and lymph nodes outside the abdominal cavity); transmural involvement of intestine | |
| Prognostic stage groups | |||
| When T is... | And N is... | And M is... | Then the stage group is... |
| T1 | N0 | M0 | I |
| T1a | N0 | M0 | IA |
| T1b | N0 | M0 | IB |
| T1c | N0 | M0 | IC |
| T2 | N0 | M0 | II |
| T2a | N0 | M0 | IIA |
| T2b | N0 | M0 | IIB |
| T1/T2 | N1 | M0 | IIIA1 |
| T3a | NX, N0, N1 | M0 | IIIA2 |
| T3b | NX, N0, N1 | M0 | IIIB |
| T3c | NX, N0, N1 | M0 | IIIC |
| Any T | Any N | M1 | IV |
| Any T | Any N | M1a | IVA |
| Any T | Any N | M1b | IVB |
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