Monochorionic twins have increased perinatal morbidity and mortality rates compared with dichorionic twins and singletons [1]. This increased risk may be due to placental vascular anastomoses, which are responsible for unbalanced blood exchange from one twin (donor) to its co-twin (recipient). The presence of these communicating vessels are essential for the development of conditions unique to monochorionic twins, such as twin–twin transfusion syndrome (TTTS) and twin reversed arterial perfusion syndrome.