Fig. 3.

The tumor has two distinct components. a A section of the tumor with attached cartilage (labeled C), skeletal and loose connective tissue was stained with H&E, showing two distinct areas (labeled R and S) within the tumor. b The round cell area, labeled R, was clearly demarcated from the spindle cell area, labeled S (magnification ×100). c The round cell area was composed of primitive-looking cells with hyperchromatic, round nuclei and amphophilic cytoplasm (magnification ×400). d The spindle cell area was composed of cells with thin elongated nuclei and eosinophilic cytoplasm (magnification ×400). High vascular density was a characteristic of this area