Download PDF
CC BY-NC-ND 4.0 · Indian J Radiol Imaging 2009; 19(01): 81-83
DOI: 10.4103/0971-3026.45352
OBSTETRIC SYMPOSIUM

Case series: TRAP sequence

M Chandramouly
Department of Radiodiagnosis, RAGAVS Diagnostic and Research Centre Pvt Ltd., Sadguru Complex, No.14, 27th Cross, 4th Block West, Jayanagar, Bangalore - 560 011, India
,
Namitha › Author Affiliations
› Further Information
Also available at
  PDF Download Permissions and Reprints

Abstract

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.

Keywords

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


Publication History

Article published online:
31 July 2021

© 2009. Indian Radiological Association. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

Thieme Medical and Scientific Publishers Private Ltd.
A-12, Second Floor, Sector -2, NOIDA -201301, India

 

  • References

  • 1 Barth RA, Crow HC. Ultrasound evaluation of multifetal gestations. In: Callen PW, editor. Callen ultrasonography in obstetrics and gynaecology. 4 th ed. Pennsylvania: W B Saunders; 2000. p. 196-8.
  • 2 Levi CS, Lyons EA, Martel MJ. Sonography of multifetal pregnancy. In: Carol M Rumack, editors. Diagnostic ultrasound. Vol. 2, 3 rd ed. Missouri: Elsivier Mosby; 2005. p. 1207-9.
  • 3 Malone FD, D′Alton ME. Anomalies peculiar to multiple gestations. Clin Perinatol 2000;27:1033-46.
  • 4 Monteagudo A, Roman AS. Ultrasound in multiple gestations: Twins and other multifetal pregnancies. Clin Perinatol 2005;32:329-54.
  • 5 Egan JF, Borgida AF. Ultrasound evaluation of multiple pregnancies. In: Callen PW, editor. Ultrasonography in obstetrics and gynecology. 5 th ed. Pennsylvania: W B Saunders; 2008. p. 286-8.
  • 6 Dashe JS, Fernandez CO, Twickler DM. Utility of Doppler velocimetry in predicting outcome in twin reversed-arterial perfusion sequence. Am J Obstet Gynecol 2001;185:135-9.