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Lipohaemarthrosis - literally means fat and blood within a joint. Its presence implies an intra-articular fracture with marrow fat having leaked out into the joint. Because fat is less dense than blood it separates on top creating a perfectly straight line known as the FBI sign (Fat-Blood Interface). The sign is best seen on lateral horizontal beam images of the knee within the suprapatellar pouch. The above patient has a tibial plateau fracture.
from our tumblr blog
http://radiologysigns.tumblr.com/
Image may be NSFW.
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Image may be NSFW.Clik here to view.
