An 11 year-old female presents with approximately 2 weeks of bilateral lower extremity pain that is localized to her knees and calves. The pain is worse with ambulation and not relieved with ibuprofen. She has difficulty ascending the stairs at school and recently started having trouble walking on flat ground. The patient also endorses neck, back, and shoulder pain that are less severe. She recalls an illness associated with vomiting and diarrhea that started approximately 1 week ago, which has still not resolved…

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