A 60-year-old, postmenopausal woman presented with lower abdominal heaviness in to our OPD. On subsequent examination 7x8cm firm mass was felt through left fornix. CA-125 was found to be 447U/ml, and her CECT was suggestive of 7.7X5.3X6.9CM solid cystic left adnexal mass. Patient underwent Primary cytoreductive surgery. Intraoperatively Left adnexal mass was present measuring 10x8cm, multiple calcified stony hard irregular shaped deposits were present in omentum and paracolic region. Final histopathology report was suggestive of high grade serous ovarian carcinoma pT3cpN0 and calcified deposits were reported as mature cartilaginous tissue. Patient subsequently received 6 cycles of adjuvant chemotherapy. Currently patient is doing well.