Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Review
. 2025 Sep 1;68(3):366-382.
doi: 10.1097/GRF.0000000000000927. Epub 2025 Mar 5.

Monochorionic Twin Gestation

Affiliations
Review

Monochorionic Twin Gestation

Taylor Pitt et al. Clin Obstet Gynecol. .

Abstract

Care of the pregnant patient with monochorionic (MC) twin gestation entails specific steps that are imperative in recognizing complications that are unique to MC placentation. Here, we will review recommendations for care of the patient with known MC twin gestation, as well as discuss the pathophysiology, diagnosis, and management of these complications including, but not limited to, twin-twin transfusion syndrome (TTTS), twin anemia-polycythemia sequence (TAPS), selective fetal growth restriction (SFGR), and twin reversed arterial perfusion (TRAP) sequence.

Keywords: SFGR; TAPS; TRAP sequence; TTTS; monochorionic twins; selective fetal growth restriction; twin anemia-polycythemia sequence; twin-twin transfusion syndrome.

PubMed Disclaimer

References

    1. Chow JS, Benson CB, Racowsky C, et al. Frequency of a monochorionic pair in multiple gestations: relationship to mode of conception. J Ultrasound Med. 2001;20:757–760.
    1. Benirschke K, Kim CK. Multiple pregnancy. 1 N Engl J Med . 1973;288:1276–1284.
    1. Bahtiyar MO, Emery SP, Dashe JS, et al. The North American Fetal Therapy Network consensus statement: prenatal surveillance of uncomplicated monochorionic gestations. Obstet Gynecol. 2015;125:118–123.
    1. Litwinska E, Syngelaki A, Cimpoca B, et al. Outcome of twin pregnancy with two live fetuses at 11-13 weeks’ gestation. Ultrasound Obstet Gynecol. 2020;55:32–38.
    1. Lewi L, Deprest J, Hecher K. The vascular anastomoses in monochorionic twin pregnancies and their clinical consequences. Am J Obstet Gynecol. 2013;208:19–30.

LinkOut - more resources