KNEE - CT
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KNEE - CT 1
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Axial CT examination of a patient with a tibial plateau fracture. CT, like radiography, utilizes x-rays to produce images. As such, CT images generally only demonstrate two levels of a lipohemarthrosis, blood and fat. Attenuation differences between the serum and cellular components is not usually identified by the eye. MRI is required for visualization of all three layers of a lipohemarthrosis.

CASE 1: These two CT images are from the 50 year old male who fell one day prior to presentation. His radiographs and MRI may be viewed as well.

Image 1: Axial CT of the knee (soft tissue window) shows the comminuted fracture of the posterior aspect of the tibial plateau. CLICK TO ENLARGE.

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Image 2: Axial CT through the patella demonstrates a fat-fluid level in the knee joint. CLICK TO ENLARGE.

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The FBI Sign: CT, MRI, and Radiographic Appearance of Lipohemarthrosis
Copyright 2000-2006 S.M. Sorenson, K. Wolfson, A. Gentili, S. Masih, L.L. Seeger. All rights reserved.