=Fibromata.=--Ovarian fibromata are very rare; they are histologically similar to fibroid tumors of other parts of the body. They do not form circumscribed new growths, but affect the whole organ, which becomes uniformly hypertrophied, preserving its general shape and anatomical relations. The tumor may contain, between the bundles of fibrous tissue, small cavities filled with fluid. The growth is usually intra-peritoneal and has a well-formed pedicle; it may, however, in exceptional cases be extra-peritoneal and develop between the layers of the broad ligament. In such a case there is difficulty in determining whether the fibroid originated in the uterus or in the ovary. Ovarian fibromata are usually of small size and slow growth. A case has been reported in which the tumor weighed over 7 pounds. _Corpora Fibrosa._--A variety of the ovarian fibromata are the corpora fibrosa, which are due to fibroid degeneration of the corpus luteum. They are tough, fibrous bodies, about the size of a pea, which are occasionally found upon the surface of the ovary. It is said that they may attain the size of a child’s head. They are usually, however, very small, and have no clinical significance. =Myomata.=--Ovarian myomata are composed chiefly of unstriped muscular fiber. They are somewhat more frequent than the pure fibromata. The two growths may be mixed, forming a fibro-myomatous tumor. The myomatous tumor may attain the weight of fifteen pounds. =Sarcomata.=--The majority of solid tumors of the ovary are sarcomatous in character, and it seems probable that many tumors that are classed as fibroids or fibro-myomata are in reality ovarian sarcomata. The growth may be either of the spindle-cell or the round-cell variety. Occasionally it is an endothelioma, a form of sarcoma developing from the endothelial cells of the blood- and lymph-vessels. Sarcoma of the ovary differs from sarcoma in other parts of the body in the fact that it is very often bilateral. Sutton states that both ovaries are affected in about 20 per cent. of the cases. Other observers state that ovarian sarcomata are usually bilateral. The surface of the tumor is smooth, and the general form and anatomical relations of the ovary are unaltered. Ovarian sarcomata are usually of median size, though they may attain enormous proportions and fill the abdominal cavity. The tumor is usually of rapid growth; in one case it attained a weight of ten pounds within a period of six months. The growth is accelerated by pregnancy. Ascites is commonly present with ovarian sarcoma, and cachexia may appear rapidly. Ascites caused by peritoneal irritation may accompany any of the solid tumors of the ovary, as other kinds of freely movable abdominal tumor. It is, however, especially characteristic of the ovarian sarcomata, and is a point of diagnostic importance.