Table 1.

FIGO staging system (Prat 2014).

Stage I	Tumour confined to ovaries
IA	Tumour limited to one ovary, capsule intact, no tumour on surface, negative washing
IB	Tumour involves both ovaries, otherwise like IA
IC	Tumour limited to one or both ovaries
IC1	Surgical spill
IC2	Capsule rupture before surgery or tumour on ovarian surface
IC3	Malignant cells in ascites or peritoneal washings.
Stage II	Tumour involves one or both ovaries with the pelvic extension (below the pelvic brim) or primary peritoneal cancer
IIA	Extension and/or implant on the uterus and/or Fallopian tubes
IIB	Extension to other 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
IIA	Positive retroperitoneal lymph nodes and/or microscopic metastasis beyond the pelvis.
IIA1	Positive retroperitoneal lymph nodes only
	IIIA1(i) Metastasis </ = 10 mm
	IIIA1 (5) Metastasis >10 mm
IIIA2	Microscopic, extrapelvic (above the brim) peritoneal involvement +/, positive retroperitoneal lymph nodes
IIIB	Macroscopic, extrapelvic, peritoneal metastases < or = 2 cm +/, positive retroperitoneal lymph nodes. Includes extension to the capsule of liver or spleen.
IIIC	Macroscopic, extrapelvic, peritoneal metastases >2 cm +/, positive retroperitoneal lymph nodes. Includes extension to the capsule of liver or spleen
Stage IV	Distant metastasis excluding peritoneal metastasis
IVA	Pleural effusion with positive cytology
IVB	Hepatic and/or spleen parenchymal metastasis to extraabdominal organs (including inguinal lymph nodes and lymph nodes outside the abdominal cavity)