RT Book, Section A1 Hoffman, Barbara L. A1 Schorge, John O. A1 Halvorson, Lisa M. A1 Hamid, Cherine A. A1 Corton, Marlene M. A1 Schaffer, Joseph I. SR Print(0) ID 1171663565 T1 Ovarian Germ Cell and Sex Cord–Stromal Tumors T2 Williams Gynecology, 4e YR 2020 FD 2020 PB McGraw-Hill Education PP New York, NY SN 9781260456868 LK accessmedicine.mhmedical.com/content.aspx?aid=1171663565 RD 2022/05/17 AB Three major categories account for virtually all malignant ovarian tumors. Organization of these groups is based on the anatomic structures from which the tumors originate (Fig. 36-1). Epithelial ovarian cancers account for 90 to 95 percent of malignant ovarian tumors (Chap. 35, p. 732). Germ cell and sex cord–stromal ovarian tumors account for the remaining 5 to 10 percent and have unique qualities that require special management (Quirk, 2005).