An 11-year-old male immigrated from Vietnam 3 years ago. He had a mass within his right upper arm for several years with rapid enlargement in the past several months. Grossly, the 10.0 × 5.0 × 2.5 cm soft tissue specimen contains a well-demarcated 8.0 × 4.5 × 2.3 nodule. The cut surface of the nodule is yellow-gray with focal hemorrhage and necrosis

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