FBI sign(redirected from Fat-Blood Interface Sign)
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
FBI signFat-blood interface Orthopedics A semi-lunar soft tissue effusion, seen in post-traumatic lipohemarthrosis, using a 'horizontal' beam X-ray; the FS is most commonly seen in the knee and in the shoulder, because of ↑ marrow fat and blood in the joint space.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.