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Ovarian sex cord-stromal tumors account for approximately 8% of all primary ovarian neoplasm, of these only 2% to 6% are sclerosing stromal tumors. The diagnosis is typically confirmed by histopathological and immunohistochemistry (IHC) studies because preoperative clinical and radiological signs may not always indicate the presence of this malignancy.Therefore, the pre-operative diagnosis is difficult due to the tumor's rarity and non-specific clinical and radiological features. Here is a case report of a young woman who had a sclerosing stromal tumor and presented with complaint of pain abdomen. The tumor markers were normal, and a substantial heterogenous enhancing lesion measuring 6.7*7.4*7.8 cm was visible in the pelvis on contrast-enhanced MRI of the abdomen and pelvis. The right ovary could not be seen apart from the lesion. She then underwent unilateral oopherectomy and final diagnosis was made after surgery with histopathological and immunohistochemistry findings.