Three decades of twin births in the USA, 1980–2009. NCHS Data Briefs 2012. www.cdc.gov/nchs/data/databriefs/db80.htmGoogle Scholar

Blickstein, I. Normal and abnormal growth of multiples. Semin Neonatol 2002;7:177–85.Google Scholar

Ananth, CV, Vintzileos, AM, Shen-Schwarz, S, Smulian, JC, Lai, Y-L. Standards of birth weight in twin gestations stratified by placental chorionicity. Obstet Gynecol 1998;91:917–24.Google ScholarPubMed

Stirrup, OT, Khalil, A, D’Antonio, F, Thilaganathan, B; Southwest Thames Obstetric Research Collaborative (STORK). Fetal growth reference ranges in twin pregnancy: Analysis of the Southwest Thames Obstetric Research Collaborative (STORK) multiple pregnancy cohort. Ultrasound Obstet Gynecol 2015;45:301–7.Google Scholar

Hamilton, EF, Platt, RW, Morin, L, Usher, R, Kramer, M. How small is too small in a twin pregnancy? Am J Obstet Gynecol 1998;179:682–5.Google Scholar

Breathnach, FM, McAuliffe, FM, Geary, M, Daly, S, Higgins, JR, Dornan, J, Morrison, JJ, Burke, G, Higgins, S, Dicker, P, Manning, F, Mahony, R, Malone, FD; Perinatal Ireland Research Consortium. Definition of intertwin birth weight discordance. Obstet Gynecol 2011;118:94–103.CrossRefGoogle ScholarPubMed

Khalil, AA, Khan, N, Bowe, S, Familiari, A, Papageorghiou, A, Bhide, A, Thilaganathan, B. Discordance in fetal biometry and Doppler are independent predictors of the risk of perinatal loss in twin pregnancies. Am J Obstet Gynecol 2015;213:222.e1–222.e10.Google Scholar

Harper, LM, Weis, MA, Odibo, AO, et al. Significance of growth discordance in appropriately grown twins. Am J Obstet Gynecol 2013;208:393.e1–5.Google Scholar

Lewi, L, Devlieger, R, De Catte, L, Deprest, J. Growth discordance. Best Pract Res Clin Obstet Gynaecol 2014;28:295–303.CrossRefGoogle ScholarPubMed

Van Mieghem, T, Deprest, J, Klaritsch, P, Gucciardo, L, Done’, E, Verhaeghe, J, Lewi, L. Ultrasound prediction of intertwin birth weight discordance in monochorionic diamniotic twin pregnancies. Prenat Diagn 2009;29:240–4.CrossRefGoogle ScholarPubMed

Victoria, A, Mora, G, Arias, F. Perinatal outcome, placental pathology, and severity of discordance in monochorionic and dichorionic twins. Obstet Gynecol 2001;97:310–15.Google ScholarPubMed

Hillman, S, Morris, R, Kilby, M. Co-twin prognosis after single fetal death: A systematic review and meta-analysis. Obstet Gynecol 2011;118(4):928–40.CrossRefGoogle ScholarPubMed

Lewi, L, Blickstein, I, Van Schoubroeck, D, et al. Diagnosis and management of heterokaryotypic monochorionic twins. Am J Med Genet A 2006;140:272–5.Google Scholar

Weksberg, R, Shuman, C, Caluseriu, O, et al. Discordant KCNQ1OT1 imprinting in sets of monozygotic twins discordant for Beckwith-Wiedemann syndrome. Hum Mol Genet 2002;11:1317–25.Google Scholar

Slaghekke, F, Kist, W, Oepkes, D, Pasman, S, Middeldorp, J, Klumper, F, Lopriore, E et al. Twin anemia-polycythemia sequence: diagnostic criteria, classification, perinatal management and outcome. Fetal Diagn Ther 2010;27(4):181–90.CrossRefGoogle ScholarPubMed

Lewi, L, Gucciardo, L, Van Mieghem, T, de Koninck, P, Beck, V, Medek, H, Van Schoubroeck, D, Devlieger, R, De Catte, L, Deprest, J. Monochorionic diamniotic twin pregnancies: Natural history and risk stratification. Fetal Diagn Ther 2010;27:121–33.Google Scholar

D’Antonio, F, Khalil, A, Pagani, G, Papageorghiou, AT, Bhide, A, Thilaganathan, B. Crown-rump length discordance and adverse perinatal outcome in twin pregnancies: Systematic review and meta-analysis. Ultrasound Obstet Gynecol 2014;44:138–46.Google ScholarPubMed

Lewi, L, Lewi, P, Diemert, A, Jani, J, Gucciardo, L, Van Mieghem, T, Doné, E, Gratacós, E, Huber, A, Hecher, K, Deprest, J. The role of ultrasound examination in the first trimester and at 16 weeks’ gestation to predict fetal complications in monochorionic diamniotic twin pregnancies. Am J Obstet Gynecol 2008;199:493.e1–7.Google Scholar

D’Antonio, F, Khalil, A, Mantovani, E, Thilaganathan, G. Embryonic growth discordance and early fetal loss: The STORK multiple pregnancy cohort and systematic review. Human Reprod 2013;28:2621–7.Google Scholar

Lewi, L, Gucciardo, L, Huber, A, Jani, J, Van Mieghem, T, Doné, E et al. Clinical outcome and placental characteristics of monochorionic diamniotic twin pairs with early- and late-onset discordant growth. Am J Obstet Gynecol 2008;199:511-e1.Google Scholar

Fick, A, Feldstein, V, Norton, M, Fyr, C, Caughey, A, Machin, G. Unequal placental sharing and birth weight discordance in monochorionic diamniotic twins. Am J Obstet Gynecol 2006;195:178–83.Google Scholar

Lewi, L, Cannie, M, Blickstein, I, Jani, J, Huber, A, Hecher, K et al. Placental sharing, birthweight discordance, and vascular anastomoses in monochorionic diamniotic twin placentas. Am J Obstet Gynecol 2007;197:587-e1.Google Scholar

Hack, K, Nikkels, P, Koopman-Esseboom, C, Derks, J, Elias, S, Van Gemert, M, Visser, G. Placental characteristics of monochorionic diamniotic twin pregnancies in relation to perinatal outcome. Placenta 2008;29:976–81.CrossRefGoogle ScholarPubMed

Lopriore, E, Pasman, S, Klumper, F, Middeldorp, J, Walther, F, Oepkes, D. Placental characteristics in growth-discordant monochorionic twins: A matched case-control study. Placenta 2012;33:171–4.Google Scholar

De Paepe, M, Shapiro, S, Young, L, Luks, F. Placental characteristics of selective birth weight discordance in diamniotic-monochorionic twin gestations. Placenta 2010;31:380–6.CrossRefGoogle ScholarPubMed

Kent, E, Breathnach, F, Gillan, J, McAuliffe, F, Geary, M, Daly, S et al. Placental cord insertion and birthweight discordance in twin pregnancies: Results of the national prospective ESPRiT Study. Am J Obstet Gynecol 2011;205:376-e1.Google Scholar

Machin, G. Velamentous cord insertion in monochorionic twin gestation. An added risk factor. J Reprod Med 1997;42:785–9.Google Scholar

Hanley, M, Ananth, C, Shen-Schwarz, S, Smulian, j, Lai, Y, Vintzileos, A. Placental cord insertion and birth weight discordancy in twin gestations. Obstet Gynecol 2002;99:477–82.Google Scholar

Matijevic, R, Ward, S, Bajoria, R. Non-invasive method of evaluation of trophoblast invasion of spiral arteries in monochorionic twins with discordant birthweight. Placenta 2002;23:93–9.Google Scholar

Yu, C, Papageorghiou, A, Boli, A, Cacho, A, Nicolaides, K. Screening for pre‐eclampsia and fetal growth restriction in twin pregnancies at 23 weeks of gestation by transvaginal uterine artery Doppler. Ultrasound Obstet Gynecol 2002;20:535–40.Google Scholar

Geipel, A, Berg, C, Germer, U, Katalinic, A, Krapp, M, Smrcek, J, Gembruch, U. Doppler assessment of the uterine circulation in the second trimester in twin pregnancies: Prediction of pre-eclampsia, fetal growth restriction and birth weight discordance. Ultrasound Obstet Gynecol 2002;20:541–5.Google Scholar

Geipel, A, Hennemann, F, Fimmers, R, Willruth, A, Lato, K, Gembruch, U, Berg, C. Reference ranges for Doppler assessment of uterine artery resistance and pulsatility indices in dichorionic twin pregnancies. Ultrasound Obstet Gynecol 2011;37:663–7.CrossRefGoogle ScholarPubMed

Sebire, N. Routine uterine artery Doppler screening in twin pregnancies?. Ultrasound Obstet Gynecol 2002;20:532–4.Google Scholar

Gratacos, E, Lewi, L, Munoz, B, Acosta‐Rojas, R, Hernandez‐Andrade, E, Martinez, J et al. A classification system for selective intrauterine growth restriction in monochorionic pregnancies according to umbilical artery Doppler flow in the smaller twin. Ultrasound Obstet Gynecol 2007;30:28–34.CrossRefGoogle ScholarPubMed

Ishii, K, Murakoshi, T, Takahashi, Y, Shinno, T, Matsushita, M, Naruse, H et al. Perinatal outcome of monochorionic twins with selective intrauterine growth restriction and different types of umbilical artery Doppler under expectant management. Fetal Diagn Ther 2009;26:157–61.Google Scholar

Gratacós, E, Antolin, E, Lewi, L, Martínez, J, Hernandez‐Andrade, E, Acosta‐Rojas, R et al. Monochorionic twins with selective intrauterine growth restriction and intermittent absent or reversed end‐diastolic flow (Type III): Feasibility and perinatal outcome of fetoscopic placental laser coagulation. Ultrasound Obstet Gynecol 2008;31:669–75.CrossRefGoogle ScholarPubMed

Gratacos, E, Ortiz, J, Martinez, J. A systematic approach to the differential diagnosis and management of the complications of monochorionic twin pregnancies. Fetal Diagn Ther 2012;32:145–55.Google Scholar

Quintero, R., Bornick, P, Morales, W, Allen, M. Selective photocoagulation of communicating vessels in the treatment of monochorionic twins with selective growth retardation. Am J Obstet Gynecol 2001;185:689–96.CrossRefGoogle ScholarPubMed

Chalouhi, G, Marangoni, M, Quibel, T, Deloison, B, Benzina, N, Essaoui, M et al. Active management of selective intrauterine growth restriction with abnormal Doppler in monochorionic diamniotic twin pregnancies diagnosed in the second trimester of pregnancy. Prenat Diagn 2013;33:109–15.CrossRefGoogle ScholarPubMed

Peeva, G, Bower, S, Orosz, L, Chaveeva, P, Akolekar, R, Nicolaides, K. Endoscopic placental laser coagulation in monochorionic diamniotic twins with type II selective fetal growth restriction. Fetal Diagn Ther 2015; 38:86–93.Google Scholar

Parra, M, Bennasar, M, Martinez, J, Eixarch, E, Torres, X, Gratacos, E. Cord occlusion in monochorionic twins with early selective intra-uterine growth restriction and abnormal umbilical artery Doppler: A consecutive series of 90 cases. Fet Diagn Ther DOI: 10.1159/000439023Google Scholar

Ishii, K, Murakoshi, T, Hayashi, S, Saito, M, Sago, H, Takahashi, Y et al. Ultrasound predictors of mortality in monochorionic twins with selective intrauterine growth restriction. Ultrasound Obstet Gynecol 2011;37:22–6.Google Scholar

De Cassia Alam Machado, R, De Lourdes Brizot, M, Liao, A, Krebs, V, Zugaib, M. Early neonatal morbidity and mortality in growth‐discordant twins. Acta Obstet Gynecol Scand 2009;88:167–71.Google Scholar

Lopriore, E, Sluimers, C, Pasman, S, Middeldorp, J, Oepkes, D, Walther, F. Neonatal morbidity in growth-discordant monochorionic twins: Comparison between the larger and the smaller twin. Twin Res Hum Genet 2012;15:541–6.Google Scholar

Gratacos, E, Carreras, E, Becker, J, Lewi, L, Enriquez, G, Perapoch, J et al. Prevalence of neurological damage in monochorionic twins with selective intrauterine growth restriction and intermittent absent or reversed end‐diastolic umbilical artery flow. Ultrasound Obstet Gynecol 2004;24:159–63.Google Scholar

Inklaar, M, Klink, J, Stolk, T, Zwet, E, Oepkes, D, Lopriore, E. Cerebral injury in monochorionic twins with selective intrauterine growth restriction: A systematic review. Prenat Diagn 2014;34(3):205–13.Google Scholar

Muñoz‐Abellana, B, Hernandez‐Andrade, E, Figueroa‐Diesel, H, Ferrer, Q, Acosta‐Rojas, R, Cabero, L, Gratacos, E. Hypertrophic cardiomyopathy‐like changes in monochorionic twin pregnancies with selective intrauterine growth restriction and intermittent absent/reversed end‐diastolic flow in the umbilical artery. Ultrasound Obstet Gynecol 2007;30:977–82.Google Scholar

Helmerhorst, FM, Perquin, DA, Donker, D, Keirse, MJ. Perinatal outcome of singletons and twins after assisted conception: A systematic review of controlled studies. BMJ 2004;328:261.Google Scholar

Khalil, A, Khan, N, Bowe, S, Familiari, A, Papageorghiou, A, Bhide, A, Thilaganathan, B. Discordance in fetal biometry and Doppler are independent predictors of the risk of perinatal loss in twin pregnancies. Am J Obstet Gynecol 2015;213:222-e1.Google Scholar

Kingdom, J, Nevo, O, Murphy, K. Discordant growth in twins. Prenatal Diagn 2005;25:759–65.Google Scholar

Heyborne, K, Porreco, R. Selective fetocide reverses preeclampsia in discordant twins. Am J Obstet Gynecol 2004;191:477–80.Google Scholar

Haimovich, Y, Ascher-Landsberg, J, Azem, F, Mandel, D, Mimouni, F, Many, A. Neonatal outcome of preterm discordant twins. J Perinat Med 2011;39:317–22.CrossRefGoogle ScholarPubMed