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A 9-year-old boy presented with a 1-day history of a palpable purpuric rash on his lower limbs 3 days after a viral illness. One week later, he developed arthralgia in his lower limbs, facial oedema and progression of the rash to his buttocks and lower arms. He did not present with any abdominal pain, blood pressure was 131/79 mm Hg and urinary protein:creatinine ratio was 183 mg/mmol with normal blood tests. …
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