Background: Cystosarcoma Phylloides is a rare breast neoplasm constituting __ampersandsignle; 1% of all breast neoplasms. These are mostly benign and reccur. Malignant cystosarcoma Phylloides can recur and metastasize to lung, bone and abdominal viscera. Metastasis to Ovary is not reported in literature. Case Report: A 46 year old multiparous lady was diagnosed with a recurrent cystosarcoma of right breast and a large Ovarian mass which was causing her dyspnoea. The mass was of 30 weeks size and was firm and tender. CECT showed a large solid abdominopelvic mass with irregular enhancing septate extending from pelvis to infracolic area with minimal free fluid. Uterus and Ovaries could not be delineated. FNAC from the mass was reported as low-grade malignant mesenchymal tumour. CA 125 was within normal range. Laparotomy revealed a large fleshy mass with jelly like material which was adherent to intestines and pelvic and parietal peritoneum. Right ovary is not visualized. Left ovary parially visualised and incorporated into the mass. Excision of the mass with TAH and BSO was carried out. There was diffuse ooze from the pelvic and peritoneal cavity which was managed by packing, blood product transfusion and tranexamic acid. She received massive transfusion and survived. Later she developed haemoptysis and underwent tracheostomy and feeding ileostomy and was managed in ICU for 8 weeks. Palliative mastectomy and adjuvant Radiotherapy and chemotherapy were differed by Oncologists and hence she was discharged after 4 months of admission. Conclusion: Managing ovarian metastasis from cystosarcoma phylloids can be challenging and the quality of life is poor when the primary disease is not managed adequately.