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Indian J Radiol Imaging. 2009 Feb;19(1):81-3. doi: 10.4103/0971-3026.45352.

Case series: TRAP sequence.

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  • 1Department of Radiodiagnosis, RAGAVS Diagnostic and Research Centre Pvt Ltd., Sadguru Complex, No.14, 27th Cross, 4th Block West, Jayanagar, Bangalore - 560 011, India.


TRAP (twin reversed arterial perfusion) sequence / acardiac twinning is a rare anomaly that occurs in monozygotic monochorionic twins with an incidence of 1% and in 1 in 35,000 pregnancies overall. The anomalous twin appears as a heterogeneous mass, simulating a teratoma or intrauterine fetal demise. As the normal twin faces increased morbidity and mortality, antenatal diagnosis with gray-scale examination, and Doppler confirmation of the diagnosis of TRAP sequence in twin pregnancies, aids in proper prenatal management. We report two cases of TRAP sequence that we encountered over a single month, with the two cases having different outcomes.


Donor and recipient twin; TRAP sequence; twin pregnancy; ultrasound

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