Final answer:
Monochorionic Diamniotic twins are identical twins that share a placenta but have separate amniotic sacs. A common complication is twin-to-twin transfusion syndrome, which can lead to irregularities in amniotic fluid levels and impact twin health.
Step-by-step explanation:
The question relates to Monochorionic Diamniotic (MoDi) twins, which are a type of monozygotic or identical twins. In the case of MoDi twins, the zygote divides during the early blastocyst stage, leading to twins sharing a single placenta and chorionic cavity while having separate amniotic sacs. One common complication associated with MoDi twins is twin-to-twin transfusion syndrome (TTTS), where there is an imbalance in the blood flow between the two twins through vascular connections in the shared placenta. This can lead to polyhydramnios (excess amniotic fluid) in one twin and oligohydramnios (reduced amniotic fluid) in the other twin. These conditions can affect the health and development of the twins.