Vasculitis Quiz: Ace Your Exams

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A 6-year-old boy is brought to the clinician's office by his parent because of a 1-day history of rash, nausea, and stomach pain. The parent reports the patient had a throat infection several weeks ago which resolved spontaneously. A few days later, he developed a hip pain that subsided and was followed by right knee and ankle pain. At the same time, he developed a rash on his legs, buttocks, and forearms. Immunizations are up to date. Vitals are within normal limits. Physical examination reveals a rash, as shown in the image below. Musculoskeletal examination reveals a swollen right knee without effusion, erythema, or warmth. Scrotal swelling and sensitivity are noted on the left side. Urinalysis shows microscopic hematuria with proteinuria. Serum electrolytes, including creatinine, are within normal limits.
A close-up view of two legs covered in a dense, red, spotty rash. The rash extends from the upper thighs down to just below the knees. Gray shorts are visible at the top.
Retrieved from: Wikimedia Commons

 Which of the following is the most likely diagnosis? 

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