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A 13-year-old boy is brought into the urgent care clinic by his father with a complaint of swelling around his right elbow. He is in 8th grade football and has been lifting weights, despite having just started puberty. He has no significant past medical history and recalls no specific incident of trauma to the elbow. On exam, the patient has a soft swelling around the posterior of the elbow. He has no redness or warmth and minimal pain. He is nontender over the bony prominences of the ulna, radial head, and humorous. What disorder of the elbow is the most likely diagnosis?(A) Arthritis(B) Olecranon bursitis(C) Epicondylitis(D) Rheumatoid nodules