PMC3350138_01
Tumour tissue. There are sheets of small round cells separated by fibrous tissue (H&E).
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fig1
Histologically, the tumour was composed of large sheets of small round cells forming lobulated nodules (Figure 1).
Immunohistochemistry with desmin: perinuclear dot-like staining (arrow).
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fig2
Immunohistochemical stains showed a patchy perinuclear staining pattern with desmin, but characteristic dot-positivity was not prominent (Figure 2).
Electron microscopy showing sparse cytoplasmic organelles with short strips of rough endoplasmic reticulum and mitochondria.
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fig3
The characteristic whorls of intermediate filaments usually present in DSRCT were not identified, and there were no dense core cytoplasmic granules (Figure 3).