P1130019

Cystadenomas are much less £requently encountcred ovarian neoplasms in the marę than granulosa celi tu-mors. In the cystadenomas examined ultrasonically thus far, the tumor tissuc varied in echogenicity and con-tained numerous cystic structures (Fig. 1.41 and 1.42), The vesicles with hypoechoic contents measured only a few millimeters in diameter.

Ovarian cysts occur only very rarely in mares. The ul-trasonic image of macrocystic ovarian degeneration fea-tures a few, very large cystic structures (Leidl and Kahn 1989). The cyst walls were echoic and remarkab-ly thin (Fig. 1.43 to 1.46). The cysts were polygonal in cross sections. The ultrasonograim showcd hardly any islands of ovarian parcnchyma between the cystic struć-tures. The diagnoses of macrocystic ovarian degeneration were based on histopathological examinatinns of the organ after ovariectomy.

Ultimately, it can be stated that the ultrasomc ap-pearance of ovarian tumors and cysts can vaiy consider-ably. An accurate diagnosis of the ovarian changes, based on ultrasonography alone, is not possible in eveiy case. In many instances, however, ultrasonography eon-tributes meaningfiilly to the establishment of a correct therapeutic conclusion.

fig. 1.45: Macrocystic ovarian degeneration in a marę. Mul-tipłe, thin waDed cysts with anechoic contents are present on theovaiy.

Fig. 1.46: Macrocystic degeneration and atrophy of the func-tional ovarian tissue in the sectioned ovaiy ftom Fig. 1.45.