[Morphological and endocrinological study of ovarian arrhenoblastoma (author's transl)].

Morphological and endocrinological studies were performed on a 19-year-old case of an arrhenoblastoma with marked virilization. The tumor was an intermediate type of Meyer's classification. Histochemically, 3 beta-HSD and G-6-PDH activities were demonstrated in Leydig cells. These cells also had ultrastructures typical of steroid-producing cells. Basal blood cells of pregnenolone, dehydroepiandrosterone, testosterone (T), androstenedione (A), progesterone, estradiol, estrone, LH, and FSH were determined pre- and postoperatively. T and A showed a very high level preoperatively, and were markedly decreased immediately after removal of the tumor. Stimulation of tumor cells by HMG-HCG did not show any significant changes in their main products of T and A. These findings suggest that Leydig cells of the present tumor produced mainly A and T independently on gonadotropins, and these hormones had virilized the patient.