<prompt> A unilateral ovarian tumour with visible peritoneal implants belong toStage IBStage ICStage IIAStage IIIB  <response>: Ovarian cancer staging:Stage 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 andor metastasis to the retroperitoneal lymph nodes. III b: macroscopic extrapelvic peritoneal metastasis or 2cm with or without positive retroperitoneal lymph nodes. Includes extension to capsule of liver spleen. III c: macroscopic extrapelvic peritoneal metastasis 2cm with or without positive retroperitoneal lymph nodes. Includes extension to capsule of liver spleen. Reference : textbook of gynaecology Sheila balakrishnan, 2nd edition, pg no: 277 