monoamniotic twins
Identical twins sharing both placenta and amniotic sac, representing the highest-risk twin pregnancy.
Full Definition
A rare form of monozygotic twinning where both twins develop within a single amniotic sac and share one placenta, occurring in approximately 1% of monozygotic twin pregnancies. This represents the highest-risk category of twin pregnancy due to the potential for cord entanglement, which can lead to fetal demise. Other complications include twin-twin transfusion syndrome and selective growth restriction. Management typically involves intensive monitoring from diagnosis and planned delivery between 32-34 weeks gestation to minimize the risk of sudden fetal death from cord accidents.
Usage
Usage note: Use 'MoMo' as informal shorthand only in internal communications; spell out fully in formal reports.
In Context
- "Monoamniotic twins were diagnosed with evidence of cord entanglement at 18 weeks." — Ultrasound report
- "MoMo twins require delivery planning by 34 weeks due to cord accident risks." — Management protocol