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(a) Pathology (hematoxylin and eosin staining, 400x) showing a dense growth of atypical cells indicating differentiation of fat cells; the atypical cells had a clear nucleolus with weakly acidophilic foamy cytoplasm. (b) Pathology (hematoxylin and eosin staining, 400x) showing differentiation of cartilage cells buried among clear cartilage tissues with the dense growth of fusiform immature undifferentiated mesenchymal cells with a high nucleocytoplasmic ratio.
