Table 1 Ovarian cancer staging (FIGO 2013 vs. FIGO 1988)

I: Tumor limited to the ovaries

I: Tumor confined to ovaries or fallopian tube(s)^a

IA: Tumor limited to 1 ovary (capsule intact), no tumor on ovarian surface, no malignant cells in ascites or peritoneal washings

IA: Tumor limited to 1 ovary (capsule intact) or fallopian tube; no tumor on ovarian or fallopian tube surface; no malignant cells in the ascites or peritoneal washings

IB: Tumor limited to both ovaries (capsules intact), no tumor on ovarian surface, no malignant cells in ascites or peritoneal washings

IB: Tumor limited to both ovaries (capsules intact) or fallopian tubes; no tumor on ovarian or fallopian tube surface; no malignant cells in the ascites or peritoneal washings

IC: Tumor limited to 1 or both ovaries with any of the following: capsule ruptured, tumor on ovarian surface, malignant cells in ascites or peritoneal washings

IC: Tumor limited to 1 or both ovaries or fallopian tube(s) with any of the following:

IC1: Surgical spill intraoperatively

IC2: Capsule ruptured before surgery or tumor on ovarian or fallopian tube surface

IC3: Malignant cells in the ascites or peritoneal washings

II: Tumor involves 1 or both ovaries with pelvic extension

II: Tumor involves 1 or both ovaries or fallopian tubes with pelvic extension (below pelvic brim) or primary peritoneal cancer^b

IIA: Extension and/or implants on uterus and/or tube(s); no malignant cells in ascites or peritoneal washings

IIA: Extension and/or implants on uterus and/or fallopian tubes and/or ovaries

IIB: Extension to other pelvic tissues; no malignant cells in ascites or peritoneal washings

IIB: Extension to other pelvic intra-peritoneal tissues

IIC: Pelvic extension (IIA or IIB) with malignant cells in ascites or peritoneal washings

III: Tumor involves 1 or both ovaries with microscopically confirmed peritoneal metastases outside the pelvis and/or regional lymph node metastasis

III: Tumor involves 1 or both ovaries or fallopian tubes, or primary peritoneal cancer, with cytologically or histologically confirmed spread to the peritoneum outside the pelvis and/or metastasis to the retroperitoneal lymph nodes

IIIA: Microscopic peritoneal metastasis beyond pelvis

IIIA1: Positive retroperitoneal lymph nodes only (cytologically or histologically proven)

IIIA1(i): Metastasis up to 10 mm in greatest dimension

IIIA1(ii): Metastasis more than 10 mm in greatest dimension

IIIA2: Microscopic extra-pelvic (above the pelvic brim) peritoneal involvement with or without positive retroperitoneal lymph nodes

IIIB: Macroscopic peritoneal metastasis beyond pelvis, 2 cm or less in greatest dimension

IIIB: Macroscopic peritoneal metastasis beyond the pelvis up to 2 cm in greatest dimension, with or without metastasis to the retro-peritoneal lymph nodes (includes extension of tumor to capsule of liver and spleen without parenchymal involvement of either organ)

IIIC: Peritoneal metastasis beyond pelvis more than 2 cm in greatest dimension and/or regional lymph node metastasis

IIIC: Macroscopic peritoneal metastasis beyond the pelvis more than 2 cm in greatest dimension, with or without metastasis to the retro-peritoneal lymph nodes (includes extension of tumor to capsule of liver and spleen without parenchymal involvement of either organ)

IV: Distant metastasis (excludes peritoneal metastasis)

IV: Distant metastasis excluding peritoneal metastases

IVA: Pleural effusion with positive cytology

IVB: Parenchymal metastases and metastases to extra-abdominal organs (including inguinal lymph nodes and lymph nodes outside of the abdominal cavity)^c