In 1907 Brenner (1) described a new type of ovarian tumor which he designated oophoroma folliculare. He believed that this type was the most mature form of the folliculoid granulosa-cell tumor. R. Meyer (2) reinvestigated the available material and showed that the Brenner tumor is macroscopically, as well as microscopically, a well defined tumor of the ovary, and has no relation to the granulosa-cell tumor. According to his statistics there were 21 cases reported in the literature, 5 being of his own observation. Since Meyer's publication, Bettinger (3) has reported two cases and Weinzierl (4) one new case, the latter being the only instance of bilateral Brenner tumor known at present. Report of a CASE1 K. G., aged fifty-nine years, white, a housewife, was admitted July 18, 1933. She had been well until two years before, when she began to suffer increasing discomfort in the lower abdomen and dizzy spells. The menopause had occurred twelve years ago, and there had been no bleeding or discharge since. Two years ago a diagnosis of pelvic tumor had been made by a physician. Physical examination on admission revealed the following irregularities: an atrophic vaginal mucosa, left rectocele, and a large, round, dense mass about the size of a full-term fetal head, filling the pelvis. A diagnosis of multiple fibroids of the uterus with possible calcification was made. Laparotomy, July 19, 1933, revealed a solid tumor of the left ovary and a normal right ovary. Left salpingectomy and oophorectomy and suspension of the uterus were performed. Convalescence was uneventful. The patient was discharged nine days later.