T sign (obstetrics)

Last revised by Assoc Prof Craig Hacking on 10 Jul 2019

The "T sign" is really the absence of a twin-peak sign (or lambda (λ) sign) and is used in ultrasound assessment of a multifetal pregnancy.

It refers to the lack of chorion extending between the layers of the intertwin membrane, denoting a monochorionic pregnancy. The intertwin membrane comes to an abrupt halt at the edge in a T configuration.

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