PMC535354_01
Coronal T2-weighted MRI reveals a slightly hyperintense fusiforme tumorous lesion of the median nerve approximately 5 cm above the right elbow (arrows).
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F1
Palpation along the median nerve revealed a fusiform mass at the distal third of the right upper arm, which could be confirmed by MRI (see figure 1 and 2).
Axial fat-suppressed T2-weighted MRI shows a tumorous lesion of the median nerve with a fascicular pattern (arrow).
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F2
Palpation along the median nerve revealed a fusiform mass at the distal third of the right upper arm, which could be confirmed by MRI (see figure 1 and 2).
Multicompartment arrangement of concentric whirl-like formations showing strong immunoreactivity with the monoclonal antibody against the epithelial membrane antigen (arrows).
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F3
In addition, small groups of regenerating axonal sprouts surrounded by perineurial ensheathment were visible, indicating some neuroma-like component (see figure 3 and 4).
Immunohistochemistry using the antibody against protein S-100: The pseudo-onion bulb formations are S-100-negative. In addition, small groups of regenerating axonal sprouts (arrows) surrounded by a perineurial ensheathment are visible indicating some neuroma-like component.
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F4
In addition, small groups of regenerating axonal sprouts surrounded by perineurial ensheathment were visible, indicating some neuroma-like component (see figure 3 and 4).