Table 2 FIGO system for ovarian cancer staging
From: MR imaging of ovarian masses: classification and differential diagnosis
Stage I | Tumour confined to ovaries | |
I A | Tumour limited to 1 ovary, capsule intact, no tumour on surface, negative washings | |
I B | Tumour involves both ovaries otherwise like IA | |
I C | Tumour limited to 1 or both ovaries | |
I C1 | Surgical spill | |
I C2 | Capsule rupture before surgery or tumour on ovarian surface | |
I C3 | Malignant cells in the ascites or peritoneal washings | |
Stage II | Tumour involves 1 or both ovaries with pelvic extension (below the pelvic brim) or primary peritoneal cancer | |
II A | Extension and/or implant on uterus and/or Fallopian tubes | |
II B | Extension to other pelvic intraperitoneal tissues | |
Stage III | Tumour involves one or both ovaries with cytologically or histologically confirmed spread to the peritoneum outside the pelvis and/or metastasis to the retroperitoneal lymph nodes | |
III A | Positive retroperitoneal lymph nodes and /or microscopic metastasis beyond the pelvis | |
III A1 | Positive retroperitoneal lymph nodes only | |
III A2 | Microscopic, extrapelvic (above the brim) peritoneal involvement ± positive retroperitoneal lymph nodes | |
III B | Macroscopic, extrapelvic, peritoneal metastasis ≤2 cm ± positive retroperitoneal lymph nodes. Includes extension to capsule of liver/spleen | |
III C | Macroscopic, extrapelvic, peritoneal metastasis >2 cm ± positive retroperitoneal lymph nodes. Includes extension to capsule of liver/spleen | |
Stage IV | Distant metastasis excluding peritoneal metastasis | |
IV A | Pleural effusion with positive cytology | |
IV B | Hepatic and/or splenic parenchymal metastasis, metastasis to extraabdominal organs (including inguinal lymph nodes and lymph nodes outside of the abdominal cavity) | |