A Rare Case of Histiocytic Sarcoma Secondary to Gastrointestinal Stromal Tumor in the Stomach: Transdifferentiation or Synchronicity?

Figure 2

H&E sections showing atypical cellular proliferation of epithelioid cells and some spindle cells (×10) (a). The tumor cells showing round or oval nuclei with nuclear hyperchromasia (×40) (b) and expressing CD34 (c) and CD117 (d).

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(b)

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