Metastatic renal cell carcinoma to the ovary: a case report and discussion of differential diagnoses.

The clinical presentation of renal cell carcinoma in the ovary is rare and may closely resemble that of other ovarian clear cell tumors. Metastatic renal cell carcinoma was diagnosed in a patient who presented with a right adnexal mass and no other significant past medical history. The gross appearance of the tumor suggested a primary ovarian neoplasm. However, microscopic and immunohistochemical analysis revealed involvement of both ovaries by a clear cell tumor with features of renal cell carcinoma. A renal mass was subsequently discovered. We discuss the clinical, histologic, and immunohistochemical features of this tumor and the features of other clear cell neoplasms in the differential diagnosis.