The poly-oli sequence seen in monochorionic/diamniotic twins is also known as what?

The poly-oli sequence seen in monochorionic/diamniotic twins is also known as what?

• A. Stuck twin
• B. Twin-twin transfusion syndrome
• C. Hydrops fetalis
• D. Vanishing twin

Answer: (A)

In monochorionic/diamniotic twins, sharing a single placenta can lead to Twin-Twin Transfusion Syndrome, where unbalanced blood flow causes one twin to receive too much fluid and the other too little. This creates a polyhydramnios in one sac and an oligohydramnios in the other—the poly-oli sequence. The term used for this specific pattern, where the donor twin with oligohydramnios becomes pressed toward the uterine wall and relatively immobile, is the stuck twin phenomenon. So the poly-oli sequence seen in MC/DA twins is described as stuck twin. The other terms describe the broader syndrome (TTTS) or different conditions altogether (hydrops fetalis, vanishing twin) and don’t capture this particular fluid pattern with the characteristic immobile donor twin.

In monochorionic/diamniotic twins, sharing a single placenta can lead to Twin-Twin Transfusion Syndrome, where unbalanced blood flow causes one twin to receive too much fluid and the other too little. This creates a polyhydramnios in one sac and an oligohydramnios in the other—the poly-oli sequence. The term used for this specific pattern, where the donor twin with oligohydramnios becomes pressed toward the uterine wall and relatively immobile, is the stuck twin phenomenon. So the poly-oli sequence seen in MC/DA twins is described as stuck twin. The other terms describe the broader syndrome (TTTS) or different conditions altogether (hydrops fetalis, vanishing twin) and don’t capture this particular fluid pattern with the characteristic immobile donor twin.