PMC1794242_01
MRI of the right hand showing a pseudosarcomatous mass encircling the ulnar artery.
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F1
Magnetic resonance imaging showed the mass to have infiltrated all skin layers and to have encircled the ulnar artery without involvement of the underlying bones (Figure 1).
Section demonstrating an intravascular proliferation of uniform spindle cells. (H&E x10).
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F2
In several areas, the lesion appeared to be intravascular, the vessel was lined by an apparent endothelium (Figure 2).