Twin reversed arterial perfusion sequence (TRAP sequence) is a condition that occurs only in identical twins that share a placenta (monochorionic), in which one twin lacking a functioning cardiac system "acardiac monster" receives blood from the normally developing twin called the "pump twin". This places an enormous demand on the heart putting the pump twin at risk for cardiac failure. Left untreated, the pump twin will die in 50 percent to 75 percent of cases. Here we present the case report of a 20 years old G2P1at 32 weeks POG with a monochorionic twin pregnancy. One of the twins was "acardiac acephalous" and the other a "pump twin" with mild hydrocephalous.

Twin reversed arterial perfusion sequence (TRAP sequence) is a condition thatoccurs only in identical twins that share a placenta (monochorionic), in which one twin lackinga functioning cardiac system “acardiac monster” receives blood from the normally developingtwin called the “pump twin”. This places an enormous demand on the heart putting the pumptwin at risk for cardiac failure. Left untreated, the pump twin will die in 50 percent to 75 percentof cases. Here we present the case report of a 20 years old G2P1at 32 weeks POG with amonochorionic twin pregnancy. One of the twins was “acardiac acephalous” and the other a“pump twin” with mild hydrocephalous.