T sign (obstetrics)

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
Share article

Article information

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

Support Radiopaedia and see fewer ads

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.