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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)