1 MCQs in OBG for NEET PG
A 27-year-old G1P0 woman with a spontaneously conceived monochorionic-diamniotic twin pregnancy presents at 21 weeks gestation with discordant amniotic fluid volumes. Ultrasound shows Twin A with oligohydramnios (deepest vertical pocket 1.4 cm, stuck twin appearance, empty bladder) and Twin B with polyhydramnios (deepest vertical pocket 10.2 cm, distended bladder), consistent with Stage II twin-twin transfusion syndrome. The structure marked **A** in the diagram represents the monochorionic placenta with surface vascular anastomoses between twin territories. Which of the following best explains the pathophysiology of TTTS in this clinical context?
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