RT Book, Section A1 Cunningham, F. Gary A1 Leveno, Kenneth J. A1 Dashe, Jodi S. A1 Hoffman, Barbara L. A1 Spong, Catherine Y. A1 Casey, Brian M. SR Print(0) ID 1190770202 T1 Neoplastic Disorders T2 Williams Obstetrics, 26e YR 2022 FD 2022 PB McGraw Hill PP New York, NY SN 9781260462739 LK obgyn.mhmedical.com/content.aspx?aid=1190770202 RD 2024/03/29 AB Any of the many neoplasms that affect reproductive-aged women can complicate pregnancy. Fortunately, most encountered neoplasms are benign, and uterine leiomyomas and ovarian cysts are the most frequent. Despite this, the incidence of malignancy approximates 1 case per 1000 to 2000 pregnancies (Korenaga, 2020; Ma, 2020). A third are diagnosed prenatally, and the remainder within 12 months of delivery. The distribution of some of these is shown in Figure 66-1 (de Haan, 2018). In another report from the Cancer Research Network, breast malignancies made up 25 percent and thyroid cancers, 20 percent. Melanoma and hematological and cervical cancers each contributed approximately 10 percent (Cottreau, 2019).