Incredibly, Although the frequency of multiple gestation is 3 to 5% at 8 weeks, vanishing twin syndrome occurs in 20-30% of all multifetal gesstations! This is not a rare occurrence. Maternal and fetal morbidity- and possibly mortality- is linked to the timing of the single fetal loss. Risks increase when a single fetus is lost in the second or third trimester. In this session, we will review the ACOG and SMFM Data regarding the vanishing twin syndrome.
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