T sign (obstetrics)

Dr Craig Hacking and A.Prof Frank Gaillard et al.

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.

Ultrasound - obstetric
Inspired signs
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Article information

rID: 2142
System: Obstetrics
Section: Signs
Tag: cases
Synonyms or Alternate Spellings:
  • T sign in twin pregnancy

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