Hematoxylin and eosin stained slides. (a) Right ovarian mass with vague nodular outlines of pseudolobular architecture with variable hypercellular and hypocellular areas, 100x. (b) Right ovarian mass with marked vascularity composed of thin-walled and hemangiopericytoma-like vessels and interlobular fibrosis, 200x. (c) Left ovary with prominent ectatic vessels, 20x. (d) Left ovary with focal stromal edema (top left) and multiple ectatic and hemangiopericytomatous vessels, 40x.