Ten cases of a distinctive, hitherto undescribed type of benign ovarian stromal tumor are reported. These tumors occurred predominantly in the second and third decades and appeared to be without function. A heterogeneous pattern, often characterized by pseudolobulation of cellular areas, a prominent tendency to sclerosis, a frequently marked vascularity, and a pronounced variation in cellular size and shape distinguished this tumor, designated “sclerosing stromal tumor” from the fibroma, thecoma, and other forms of ovarian stromal tumor.
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