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INTRODUCTION : Giant ovarian tumors have become rare because of the early detection of adnexal pathology with the advent of routine imaging modalities in the recent era of medical practice. Serous cystadenoma is a cystic ovarian tumor containing a serous fluid and a solid-tissue component. Serous cystadenoma is the most common benign epithelial tumor accounting for 30% of all ovarian tumors. They can be bilateral in 10% of cases. CASEREPORT: A case of 52years old postmenopausal women presented with pain abdomen, distension and bloating sensation for 3 months. On general examination, vitals stable. A detailed per abdomen examination revealed a well defined abdomino-pelvic mass of approximately 12 to 15 cms occupying right iliac fossa, lumbar and umbilical regions, cystic in consistency. The mass is mobile longitudinally and transversely. USG abdomen and pelvis scan showed a well defined, smooth marginated, thin walled, cystic lesion noted in the midline of pelvis extending upto the level of umbilicus approximately measuring 16x8x17cm and approximate volume of 1240cc with free floating thin echogenic internal debris and thin internal septations. No evidence of internal vascularity. CECT confirmed the usg findings and likely to be right ovarian origin with RMI 53.4 .CA-125 value 17.8. A Provisional diagnosis of benign ovarian mass was made. She underwent staging laparotomy ,TAH and BSO. Intra-op findings were right ovarian mass of 15x18cm?clear, weighing of 2kgs , Cystic lesion in left ovary both were sent for frozen section. Uterus and cervix sent for HPE. Frozen section report confirmed features suggestive of bilateral benign serous cystadenoma of ovaries. CONCLUSION :Giant ovarian tumors though very rare in current scenario due to early detection through advanced imaging diagnostics still need high index of suspicion due to vague and non- specific symptomatology. If detected early can be dealt with minimal invasive methods like laparoscopy and reduced mobility.