FIGO staging of ovarian carcinoma

Stage ITumor limited to ovaries or fallopian tubes
Stage IATumor limited to one ovary or fallopian tube; no tumor on ovarian or fallopian tube surface; no malignant cells in ascites or peritoneal washings
Stage IBTumor limited to both ovaries or fallopian tubes; no tumor on fallopian tube or ovarian surface; no malignant cells in ascites or peritoneal washings
Stage ICTumor limited to one or both ovaries or fallopian tubes; with 
IC1: surgical spill
IC2: capsule ruptured before surgery or tumor on ovarian or fallopian tube surface
IC3: malignant cells in  ascites or peritoneal washings
Stage II Tumor involves one or both ovaries or fallopian tubes with pelvic extension (below pelvic brim) or primary peritoneal cancer
Stage IIAExtension and/or implants on uterus and/or fallopian tubes and/or ovaries
Stage IIBExtension to other pelvic intraperitoneal tissues
Stage IIITumor involves one or both ovaries or fallopian tubes, or primary peritoneal cancer with histologically confirmed spread to peritoneum or outside pelvic and/or metastasis to retroperitoneal lymph nodes 
Stage IIIA1Positive retroperitoneal lymph nodes only
IIIA1 metastasis up to 10 mm in greatest dimension
IIIA2 metastasis > 10 mm in greatest dimension
Stage IIIA2Microscopic extrapelvic (above pelvic brim) peritoneal involvement with or without positive retroperitoneal lymph nodes
Stage IIIBMacroscopic peritoneal metastasis beyond pelvis up to 2 cm in greatest dimension, with or without metastasis to retroperitoneal lymph nodes
Stage IIICMacroscopic peritoneal metastasis beyond pelvis > 2 cm in greatest dimension, with or without metastasis to retroperitoneal lymph nodes (includes extension of tumor to capsules of liver and spleen without parenchymal involvement of either organ
Stage IVDistant metastasis excluding peritoneal metastasis
Stage IVAPleural effusion with positive cytology
Stage IVBParenchymal metastases and metastases to extra abdominal organs (inguinal lymph nodes and lymph nodes outside abdominal cavity