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Ultrasound Imaging in Multifetal Pregnancies: Its

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Monochorionic Tw<strong>in</strong>s<br />

Selective IUGR<br />

• 10-15% of monochorionic tw<strong>in</strong>s<br />

• Smaller tw<strong>in</strong> EFW < 10%tile for gestational age<br />

• Unequal placental shar<strong>in</strong>g<br />

• +/- Unbalanced <strong>in</strong>tertw<strong>in</strong> vascular flow<br />

• Per<strong>in</strong>atal mortality & long term morbidity<br />

- Smaller tw<strong>in</strong>: IUFD 30-40% Neurologic 15-40%<br />

- Cotw<strong>in</strong> tw<strong>in</strong>: IUFD 25-30% Neurologic 20-30%<br />

- iatrogenic prematurity<br />

- acute feto-feto transfusion

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