1. 
   vanishing twin syndrome
   the disappearance of one fetus following the sonographic diagnosis of a twin pregnancy, with only one twin eventually being delivered; the vanished twin may be resorbed or incorporated into the placental membrane.
   Found op http://www.encyclo.co.uk/local/21001
   
   
2. 
   Vanishing Twin Syndrome
   A common and potential problem in pregnancies with more than one baby is the so-called vanishing twin syndrome. This is most often detected early in the pregnancy. An ultrasound will detect twins in the first trimester but only one grows to term. Why this happens is not completely understood. The lo...
   Found op http://www.pregnology.com/AZ/V/1
   
   

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