Twin pregnancies carry a higher risk of congenital and structural malformations, and pregnancy complications including miscarriage, stillbirth, and intrauterine fetal death, compared with singleton pregnancies. Carrying a fetus with severe malformations or abnormal karyotype places the remaining healthy fetus at an even higher risk of adverse outcome and pregnancy complications. Maternal medical conditions or complicated obstetrical history could, in combination with twin pregnancy, cause increased risks for both the woman and the fetuses. To our knowledge, no previous studies have evaluated and compared the outcomes of all dichorionic twin pregnancies and compared the results of reduced twins with those of nonreduced and primary singletons in a national cohort. These data are important for clinicians when counseling couples about fetal reduction and its implications.

Obstetric and oncological data of pregnant patients with a diagnosis of renal or bladder cancer were selected from the worldwide registry of the International Network of Cancer, Infertility and Pregnancy. In addition, the literature was reviewed for recent case reports since last reviews in 2014 for renal cancer and 2004 for bladder cancer.

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Sofia
Journal Co-ordinator
Journal of Women's Health and Reproductive Medicine