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Four young women, all of whom were <30 years of age and had a variety of menstrual irregularities, had ovarian thecomas that were remarkable because of the presence of extensive calcification. The calcification was visible on x-ray examination of the abdomen in one case and was appreciated grossly in all four. Microscopic examination revealed that the calcification was the most striking microscopic feature in all the cases; in one case it was psammomatous. One tumor also exhibited extensive adipose metaplasia. Only two other extensively calcified thecomas havd been reported in detail in the literature; one of them also occurred in a young woman. Extensively calcified thecomas appear to occur in younger women more often than thecomas that are not calcified or minimally calcified, and enter into the differential diagnosis in a patient with adnexal calcification on x-ray examination of the abdomen.