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Unusual soft tissue mass in a 43-year-old man.

A 43-year-old man presented with a 3year history of a painless and slowly enlarging mass in the middle of his right leg. A few months before admission to the hospital, the patient had a few episodes of mild direct trauma to the middle of his leg directly over the mass. There was no history of fever, chills, or sweats. The patient did not smoke tobacco or drink alcohol. His medical history was unremarkable and there was no family history of malignant disease.