Table 2 FIGO staging of ovarian, Fallopian tube and primary peritoneal cancer (FIGO 2013 vs. FIGO 1988) – differences highlighted in bold.

FIGO (1988)	FIGO (2013)
* There is no stage I peritoneal carcinoma.** Thick adhesions with histologically verified tumor metastases require upstaging from stage I to II.*** Extraabdominal metastases includes transmural intestinal infiltration and umbilical metastases.
I: tumor confined to the ovaries	I: tumor confined to the ovaries or tube(s)*
IA: tumor confined to 1 ovary (capsule intact), no tumor on ovarian surface, no malignant cells in the ascites or peritoneal cytology	IA: tumor confined to 1 ovary or tube (capsule intact), no tumor on ovarian surface, no malignant cells in the ascites or peritoneal cytology
IB: tumor involves both ovaries (capsule intact), no tumor on ovarian surface, no malignant cells in the ascites or peritoneal cytology	IB: tumor involves both ovaries or tubes (capsule intact), no tumor on the ovarian or tubal surface, no malignant cells in the ascites or peritoneal cytology
IC: tumor limited to 1 or both ovaries together with one of the following: capsule rupture; tumor on ovarian surface; malignant cells in the ascites or peritoneal cytology	IC: tumor limited to 1 or both ovaries or tube(s) together with one of the following:
	IC1: capsule rupture intraoperatively
	IC2: capsule rupture preoperatively or tumor on ovarian or tubal surface
	IC3: malignant cells in the ascites or peritoneal cytology
II: tumor in 1 or both ovaries with pelvic involvement	II: tumor in 1 or both ovaries or tube(s) with pelvic involvement or primary peritoneal carcinoma**
IIA: extension and/or implant on uterus and/or Fallopian tube(s); no malignant cells in the ascites or peritoneal cytology	IIA: extension and/or implant on uterus and/or Fallopian tube(s) and/or ovar(ies)
IIB: extension to other pelvic tissue; no malignant cells in the ascites or peritoneal cytology	IIB: extension to other pelvic intraperitoneal tissue
IIC: IIA or IIB plus malignant cells in the ascites or peritoneal cytology
III: tumor in 1 or both ovaries with microscopic extrapelvic peritoneal metastases and/or regional lymph node metastases	III: tumor in 1 or both ovaries or tube(s) or primary peritoneal carcinoma with cytologically or histologically verified peritoneal metastases outside the pelvis and/or retroperitoneal lymph node metastases.
IIIA: microscopic extrapelvic peritoneal metastases
	IIIA1: positive retroperitoneal lymph nodes only (verified cytologically or histologically)
	IIIA1(i): metastases, maximum diameter 10 mm
	IIIA1(ii): metastases, maximum diameter more than 10 mm
	IIIA2: microscopic extrapelvic peritoneal metastases with or without positive retroperitoneal lymph nodes
IIIB: macroscopic extrapelvic peritoneal metastases of up 2 cm	IIIB: macroscopic peritoneal pelvic metastases of up to 2 cm, with or without retroperitoneal lymph node metastases (including the capsule of the liver/spleen but excluding parenchymatous metastasis)
IIIC: macroscopic extrapelvic peritoneal metastases larger than 2 cm and/or regional lymph node metastases	IIIC: macroscopic extrapelvic peritoneal metastases larger than 2 cm with or without retroperitoneal lymph node metastases (including capsule of the liver/spleen but excluding parenchymatous metastases)
IV: distant metastases excluding peritoneal metastases	IV: distant metastasis excluding peritoneal metastases
	IVA: pleural effusion with positive cytology
	IVB: parenchymatous metastases and metastases to extraabdominal organs (including inguinal lymph node metastases and extraabdominal lymph node metastases)***