Ultrasound finding | TTTS | TAPS | sFGR |
Fluid discordance | +++++ Oligohydramnios in one sac and polyhydramnios in the other sac | – | ++ Oligohydramnios in the sac of the intrauterine growth restricted twin, normal amniotic fluid volume in the AGA twin |
Growth discordance (>25% difference between twins) | ++ 50% will have estimated fetal weight <10th percentile | + | +++++ 100% will have estimated fetal weight <10th percentile |
MCA Doppler discordance (>1.5 MoM in donor/anemic and <0.8 MoM in recipient/plethoric) | ++ | +++++ | + |
Fetal bladder discordance | Small donor bladder and/or enlarged recipient bladder | – | – |
Ductus venosus abnormalities | +++++ | ++ | ++ |
Fetal hydrops | +++++ | + | – |
Placental appearance: Donor side hyperechoic and thickened, recipient side normal | ++ | +++++ | – |
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