PMC3758710_01
Magnetic resonance imaging scan showing hyperintense cystic lesion
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F1
On magnetic resonance imaging, a well-defined, oval shaped, hyperintense cystic lesion, of 6.6 x 4.8 cm in anterolateral compartment of arm was noted [Figure 1].
Cut surface of the tumor showing cystic degeneration
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F2
Cut section revealed uniloculated cyst filled with gelatinous material and the inner lining of the wall was smooth [Figure 2].
Section showing hypocellular and hypercellular area (H and E, x400)
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F3
Hypercellular areas show spindle shaped cells having wavy nuclei arranged in fascicles with focal palisading of nuclei [Figure 3].
Histological findings showing sheets of foamy macrophages (H and E, x400)
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F4
Hypocellular areas showed large number of foamy macrophages and loose myxoid stroma [Figure 4].
Immunohistochemistry pictures showing cytoplasmic S-100 positivity (IHC, S-100, x100)
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F5
On IHC tumor cells showed diffuse cytoplasmic positivity for S-100 protein [Figure 5] and was negative for KI67 [Figure 6]; confirming the diagnosis of schwannoma.
Immunohistochemistry (IHC) showing KI67 negativity (IHC, KI67, x100)
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F6
On IHC tumor cells showed diffuse cytoplasmic positivity for S-100 protein [Figure 5] and was negative for KI67 [Figure 6]; confirming the diagnosis of schwannoma.