Abstract: 100 cases of fibrome and thecoma of ovary were analyzed with three groups histopathologically.The results of double blind trial from clinic and pathology indicated that ovarian fibroma and thecona both originated from ovarian mesenchym with transitional in morphology.It is easy to distinguish among typical tumors,but it is difficult for cellular fibroma and thecofibroma.The fat and collagen(V.G)stain are need.

Key words: Ovarian fibroma, thecoma, histopathology