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Second- and third-trimester ultrasound evaluation of chorionicity and amnionicity in twin pregnancy. A simple
A Monteagudo1, I E Timor-Tritsch
1Bellevue Hospital, New York, New York, USA. ana.monteagudo@med.nyu.edu
Objective:
To develop a simple and systematic algorithm to determine chorionicity and amnionicity in the second and third trimester by ultrasound.
Study Design:
The algorithm was constructed based upon years of experience in examining multifetal pregnancies and by adopting the different sonographic signs suggested in the literature.
Results:
The following parameters were used to construct the algorithm: sexing of the fetuses, placental location, and origin, thickness and number of layers of the membranes.
Conclusion:
The flow chart developed is simple to use and embodies all possible sonographic parameters to help determine chorionicity and amnionicity in the second and third trimester.