Lambda sign – describes the triangular appearance to chorion…

Lambda sign – describes the triangular appearance to chorion insinuating between layers of the inter-twin membrane and is an important indicator of dichorionic twin pregnancy. Also known as the twin-peak sign, it is best seen in the first trimester between 10 – 14 weeks. Chorionicity status has major management implications for multifetal pregnancies which makes assessment for this sign essential. The analogous sign in monochorionic twin pregnancy is the T-sign where no chorion extends between the edges of the inter-twin membrane.  

from our tumblr blog: http://radiologysigns.tumblr.com/post/25142696652

http://radiologysigns.tumblr.com/

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