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Bilateral primary synchronous ovarian neoplasms are rarely encountered in clinical practice. Both ovaries harboring neoplasms is predominantly appreciated as, metastasis from a distant primary or secondary from an advanced primary ovarian neoplasm. However in both the above instances, the histomorphological evaluation is of paramount importance. We encountered an incidental left ovarian, International Federation of Gynecology and Obstetrics grade 2, endometrioid carcinoma in a patient presenting with a right ovarian mass immunohistopathologically proven to be clear cell carcinoma. The documentation of such rare occurrence is of utmost importance for better understanding of histogenesis of ovarian cancers, which may impact management strategies. [ABSTRACT FROM AUTHOR]