title: Editorial-Special Issue.
abstract: Monochorionic twin pregnancies are subject to unique complications that can threaten the life and well-being of both fetuses, resulting in a disproportionate increase in perinatal morbidity and mortality.
authors.forename: Mark P
authors.initials: MP
authors.lastname: Umstad
authors.forename: Ricardo
authors.initials: R
authors.lastname: Palma-Dias
authors.forename: Asma
authors.initials: A
authors.lastname: Khalil
mesh_terms: D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D054238:Perinatal Mortality; D011247:Pregnancy; D011248:Pregnancy Complications / Q000401:mortality* / Q000503:physiopathology; D011256:Pregnancy Outcome; D059285:Pregnancy, Twin / Q000235:genetics* / Q000502:physiology; D014430:Twins, Monozygotic / Q000235:genetics*