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Keywords:

  • First Trimester;
  • Prenatal Diagnosis;
  • Fetal Heart Abnormalities;
  • Acardiac Twin;
  • Monochorionic Twin

Abstract

A case of twin reversed arterial perfusion (TRAP) sequence was diagnosed at 12 weeks' gestation using transvaginal color Doppler ultrasound, which demonstrated the presence of retrograde perfusion in the umbilical artery of the abnormal twin. Ultrasound imaging showed a monochorionic-diamniotic twin pregnancy with an inappropriately grown second twin, the morphological evaluation of which revealed an abnormal cephalic pole with acrania, diffuse subcutaneous edema and the presence of cardiac activity in an abnormal heart with a single chamber. Copyright © 1999 International Society of Ultrasound in Obstetrics and Gynecology