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Prevalence and MRI-Anatomic Correlation of Bone Cysts in Osteoarthritic Knees

Caroline Pouders1,2, Michel De Maeseneer3, Peter Van Roy1, Jan Gielen4, Annietta Goossens5 and Maryam Shahabpour2

1 Department of Experimental Anatomy, Vrije Universiteit Brussels, Laarbeeklaan 103, 1090 Brussels, Belgium.
2 Department of Radiology, AZ-Vrije Universiteit Brussels, Brussels, Belgium.
3 Division of Radiological Sciences, Wake Forest University, Winston-Salem, NC.
4 Department of Radiology, University of Antwerp, Antwerp, Belgium.
5 Department of Pathology, AZ-Vrije Universiteit Brussels, Brussels, Belgium.


Figure 1
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  		Fig. 1 —87-year-old man with osteoarthritis. Sagittal T1-weighted spin-echo image of weight-bearing area of tibial specimen. Note surface of cartilage (white arrows) and cartilage-subchondral bone interface (black arrows). S = subchondral bone.

 

Figure 2
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  		Fig. 2A —Weight-bearing area of tibial specimen in 82-year-old man with osteoarthritis. In sagittal T1-weighted spin-echo image, cyst appears hypointense (arrow).

 

Figure 3
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  		Fig. 2B —Weight-bearing area of tibial specimen in 82-year-old man with osteoarthritis. In sagittal T2-weighted gradient-echo image, hyperintense cystic structure in weight-bearing area is seen (arrow).

 

Figure 4
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  		Fig. 3A —Weight-bearing area of tibial specimen in 69-year-old man with osteoarthritis. Sagittal T1 spin-echo image shows hypointense intraosseous cyst with hypointense margins (arrow). No joint space communication is seen.

 

Figure 5
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  		Fig. 3B —Weight-bearing area of tibial specimen in 69-year-old man with osteoarthritis. Sagittal T2 gradient-echo image shows hyperintense intraosseous cyst surrounded by hypointense margins (arrow).

 

Figure 6
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  		Fig. 3C —Weight-bearing area of tibial specimen in 69-year-old man with osteoarthritis. Sagittal anatomic slice of same region shows rounded cystlike structure containing amorphous fragments (arrow).

 

Figure 7
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  		Fig. 4A —Interspinous area of tibial specimen in 82-year-old woman with osteoarthritis. Sagittal T2 gradient-echo image shows hyperintense cyst (arrows) surrounded by hypointense margins.

 

Figure 8
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  		Fig. 4B —Interspinous area of tibial specimen in 82-year-old woman with osteoarthritis. Sagittal T1 spin-echo image shows hypointense cystlike structure surrounded by margin with lower signal intensity than cyst (arrows).

 

Figure 9
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  		Fig. 5 —Histologic stain of cyst in 82-year-old woman with osteoarthritis. Fibrous connective tissue layer with adipocytes and osteoblasts is seen (F). Cyst cavity (C) contains necrotic bone fragments with dead denuclearized cells. (Harris hematoxylin)

 

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