A 33-year-old man presents to get the swelling in his right thigh evaluated. He first noticed the swelling 8 to 10 weeks ago and attributed it to injuries incurred during long-distance running. The patient has no known medical problems. He is physically fit and runs approximately 3 to 5 miles daily. On examination, he is found to have a 6 × 5 cm, firm, non-tender mass in the anterior portion of the right thigh. There are no skin or motor/sensory changes in the right leg and no lymphadenopathy in the right groin.

A radiograph of the thigh reveals no bony abnormalities. What is the most likely diagnosis for this patient, and what is the best therapy for him? *This Case Challenge is from the Editorial Team of Docplexus and is meant for educational purposes only. Source: Case Files Surgery ##Disclaimer## The content provided on Docplexus is intended for educational purposes only. While we…