Question

A 69-year-old man presented with a solitary, painless swelling on the lateral aspect of his left thigh that had been present, unchanged for 10 years. His medical history included chronic obstructive pulmonary disease, hypertension and bilateral knee osteoarthritis.

Fig. 1
figure 1

Magnetic resonance imaging of the thigh, including a axial T1-weighted, b coronal T2-weighted and c axial fat-suppressed T1-weighted images after gadolinium administration, was followed by ultrasound-guided core biopsy

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