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Article Abstract
We report an exceptional case of a spindle cell mesenchymal tumor with S100 and CD34 co-reactivity, which harbored a fusion. To the best of our knowledge, this is the second case of a spindle cell mesenchymal tumor with S100 and CD34 co-reactivity with this specific fusion. Remarkable is the presence of calcification and heterotopic ossification in the center of our lesion, a feature that, to our knowledge, has not been described yet in -rearranged spindle cell mesenchymal tumors.
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