Twin-to-twin transfusion syndrome treatment in Jordan

Twin-to-twin transfusion syndrome is an imbalance in blood distribution between twins who share a single placenta and are connected by communicating vessels on its surface: one twin receives more blood and fluid than it needs (the recipient) while the other remains underperfused (the donor). In advanced cases the treatment is laser coagulation of those communicating vessels through a fine fetoscope introduced into the amniotic sac under ultrasound guidance, which separates the two circulations and stops the unbalanced transfer. The syndrome occurs only in monochorionic twin pregnancies, which is why this type of pregnancy is followed with ultrasound roughly every two weeks from around the sixteenth week. Diagnosis is sonographic rather than laboratory-based: excess fluid around one twin and severe deficiency around the other until it appears stuck against the uterine wall, together with differences in bladder size and Doppler findings. From these features a stage is assigned, and the stage guides the decision. Related but distinct conditions exist, including selective growth discordance and the anaemia-polycythaemia sequence, each with its own management. Options depend on stage and gestational age: close surveillance in very early mild cases; fetoscopic laser coagulation, which is the preferred treatment for advanced disease within a defined window of pregnancy; amnioreduction as an adjunct or when laser is not feasible; and, in extreme situations, difficult selective options that are explained in detailed counselling. The procedure requires a centre experienced in fetal medicine, and early referral is part of the treatment rather than an administrative detail. The limits deserve plain statement. Laser coagulation removes the cause but **cannot undo damage that occurred before it**, does not eliminate the risk of preterm birth or membrane rupture, cannot guarantee the survival of both twins, and occasionally leaves a small residual connection that requires reassessment. Not every size difference between twins is transfusion syndrome, and not every increase in fluid means an intervention is needed. Suitability for each option is determined by specialist examination and ultrasound rather than by reading, and it is reviewed weekly because the situation changes quickly.