The Trial of Pessary After Laser for TTTS

Inclusion Criteria: * Monochorionic twin pregnancies with severe TTTS requiring intrauterine surgery * Less than 26 weeks * Minimal age of 18 years * Informed consent signature Exclusion Criteria: * Major fetal abnormalities (requiring surgery or leading to infant death or severe handicap) * Cerclage prior to randomisation * Uterine malformation * Placenta previa * Active vaginal bleeding at the moment of randomization * Spontaneous rupture of membranes at the time of randomization * Death of both twins after the surgery * Monochorionic-monoamniotic twin pregnancy * Silicone allergy * Current participation in other RCT