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Case report- A 55 year-old postmenopausal woman with previous 2 LSCS presented with a complaint of a gradual distension of the abdomen from the last 2 months. A per abdominal examination revealed a large abdominal mass corresponding to a 34-weeks gestational-size uterus. MRI findings suggest large cystic lesion in abdomino pelvic cavity with multiple internal septations originating from right ovary suggestive of large complex ovarian cyst. The patient underwent an exploratory laparotomy with left ovarian cystectomy, with total abdominal hysterectomy with bilateral salpingo-oopherectomy. Intraoperative findings showed a large ovarian mass of size 30? 25? 20cm with smooth surface with solid cystic component arising from left ovary. Uterus was dextro rotated and mass was lying in between two layers of broad ligament and small bowel was adhered near to the pedicle of ovarian mass. A mass of 30 ? 25? 20cm size with a weight of 7.1 kg was successfully removed. Final impression was suggestive of a benign serous cystadenoma. The postoperative course of the patient was uneventful. Conclusion- Ovarian epithelial tumors comprise about half of all ovarian tumors, accounting for about 40% of benign tumors. Benign serous tumors are common, accounting for about 25% of all benign ovarian neoplasms. This is one of the largest benign serous cystadenoma reported in our institute. The anatomy was distorted as uterus was dextrorotated due to the bulk of tumour .