"stage I: oligohydramnios/polyhydramnios"
"stage II: bladder not visible in donor twin"
"stage III: abnormal Dopplers in either twin"
"stage IV: hydrops fetalis in either twin *"
"stage V: in utero demise of either twin"
"NT discordance: 20% or more"
"in certain cases, fetal echocardiography may also show AV valve incompetence"
"folding of the inter-twin membrane as an early sign due to a disparity in amniotic fluid volumes (amniotic fluid discordance)"
"polyhydramnios (deepest vertical pocket (DVP) >8 cm)"
"Serial sonographic monitoring is common practice. In an uncomplicated monochorionic twin pregnancy, TTTS screening should start from 16 weeks gestation with assessment of fetal growth, deepest vertical pockets, and umbilical arterial pulsatility index (UA-PI) performed every two weeks. Detailed morphology ultrasound is routine at 20 weeks. Additional fetal middle cerebral arterial-peak systolic velocity (MCA-PSV) is recommended from 22 weeks."
"Doppler abnormalities: predominantly venous"
"Doppler abnormalities: predominantly umbilical artery +/- venous"
"Colour Doppler"
Expected headings
"Staging"
"Variants"
"First trimester"
"Second and third trimesters"
"Colour Doppler"
"* Almost always in the recipient; rarely in the donor if there is coexistent TAPS (see below)."