Definition and diagnosis of twin transfusion syndrome (TTTS) TTTS is a unique complication of monochorionic twins, It accounts for 10% ~ 15% of monochorionic twins, and its pathogenesis is still unclear. It is mainly related to the common placenta of monochorionic twins and a large number of vascular anastomoses at the placenta level. The fetal mortality rate of untreated TTTS 24 weeks ago can reach 90% ~ 100%, and the proportion of neurological sequelae in surviving fetuses is as high as 17% ~ 33% even if they survive. The diagnostic criteria for TTTS are: During ultrasound follow-up of monochorionic twins, If a fetus has too much amniotic fluid (the maximum depth of amniotic fluid is greater than 8cm before 20 Read More …