ABSTRACT
Monoamniotic (MA) multiples were first described by Boccalini in 1612. The condition is characterized by a single amniotic cavity, a single placenta and two umbilical cord insertions close to each other. The first review to emphasize the significantly higher morbidity and mortality (40-70%) and the low prevalence (2-5% of all monochorionic (MC) twin pregnancies) of MA twin pregnancies appeared in 19351. The second survey of the American literature was published in 19592. More recently, three review articles have appeared on prenatal diagnosis and management of MA twin pregnancies3-5. The pathology is well described in classical texts6.
