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Axial T1-weighted sequences of the left arm before (a) and after (b) gadolinium contrast medium administration that show the intense and heterogeneous enhancement of the mass. Note the absence of the split fat sign. (c) Image of histological hematoxylin and eosin staining of the lesion at 40x, showing the epithelioid cells with abundant eosinophilic cytoplasm and prominent nucleoli. (d) The tumor cells display diffuse and strong S100 protein positivity.
