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(a) Ileal location of a spindle-cell malignant mesenchymal proliferation (HE × 25); (b) the tumor cells are provided with very atypical, pleomorphic, and mitotic nuclei (HE × 100); they express H-Caldesmon (IHC × 100) (c) and Desmin (d) (IHC × 100) and were negative for CD117 (e) and Dog1 (f) (IHC × 100).
