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Benign ovarian steroid cell tumor, NOS. (A) Macroscopic appearance: Note the well-circumscribed, solid, yellow-brown tumor. (B) Microscopic appearance: cells with small round nuclei, mild atypia, and no mitosis are arranged in a diffuse pattern of columns or nests separated by a rich vascular network. The cells demonstrate abundant pale cytoplasm and no crystals of Reinke (H&E, 20×).
