Acardiac Twin Syndrome

A very rare condition that occurs in 1 out of every 35,000 twin pregnancies. One of the twins is normal (also known as the pump twin) and the other twin is only body-like tissue with legs and a lower body (known as the acardiac twin). The upper body and heart are not present. However, abnormal blood vessels on the placenta allow the normal twin to
Found on http://www.pregnology.com/AZ/A/2
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