Table 1 2014 FIGO staging system for ovarian, fallopian tube, and peritoneal cancer1

From: SEOM clinical guideline in ovarian cancer (2020)

Stage I Tumour confined to ovaries or fallopian tube(s)
 IA Tumour limited to one ovary (capsule intact) or fallopian tube; no tumour on ovarian or fallopian tube surface; no malignant cells in the ascites or peritoneal washings
 IB Tumour limited to both ovaries (capsules intact) or fallopian tubes; no tumour on ovarian or fallopian tube surface; no malignant cells in the ascites or peritoneal washings
 IC1 Tumour limited to one or both ovaries or fallopian tubes, with surgical spill
 IC2 Tumour limited to one or both ovaries or fallopian tubes, with capsule ruptured before surgery or tumour on ovarian or fallopian tube surface
 IC3 Tumour limited to one or both ovaries or fallopian tubes, with malignant cells in the ascites or peritoneal washings
Stage II Tumour involves one or both ovaries or fallopian tubes with pelvic extension or primary peritoneal cancer
 IIA Extension and/or implants on uterus and/or fallopian tubes and/or ovaries
 IIB Extension to other pelvic intraperitoneal tissues
Stage III Tumour involves one 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
 IIIA1 Positive retroperitoneal lymph nodes only (cytologically or histologically proven)
  IIIA1(i) Metastasis up to 10 mm
  IIIA1(ii) Metastasis more than 10 mm
 IIIA2 Microscopic extrapelvic (above the pelvic brim) peritoneal involvement with or without positive retroperitoneal lymph nodes
 IIIB Macroscopic peritoneal metastasis beyond the pelvis up to 2 cm in greatest dimension, with or without metastasis to the retroperitoneal lymph nodes
 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 tumour to capsule of liver and spleen without parenchymal involvement of
either organ)
Stage 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)