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|Desmoplastic small round cell tumor (DSRCT) is a highly malignant neoplasm that was first described in 1989 by Gerald and Rosai. It usually affects young persons during the second decade of life with a striking male predilection.
Pathology reveals well circumscribed solid tumor nodules within a dense desmoplastic stroma. Often areas of central necrosis are present. Tumor cells have hyperchromatic nuclei with increased nuclear/cytoplasmic ratio.
On immunohistochemistry, these cells have trilinear coexpression including the epithelial marker cytokeratin, the mesenchymal markers desmin and vimentin, and the neuronal marker neuron-specific enolase. Thus, although initially thought to be of mesothelial origin due to sites of presentation, it is now hypothesized to arise from a progenitor cell with multiphenotypic differentiation.
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Saturday, August 02 2008 @ 04:38 PM CDT
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