CC: An 8 year old white male

CC: An 8 year old white male presents with an erythematous skin rash over the buttocks and legs together with joint pains and hematuria. HPI: Three days before, he had complained of cough, coryza, low grade fever, and sore throat. He has a history of allergy to dust and pollen. VS: hypertension. PE: palpable purpuric skin lesions over buttocks and legs; painful restriction of knee and ankle joint movement with swelling. (See pictures) Labs CBC: normal platelet count; normal coagulation tests. Increased erythrocyte sedimentation rate (ESR); increased BUN and serum creatinine. UA: RBCs and RBC casts on urinary sediment. Positive stool guaiac test. 1. What is the most common pathology related to this presentation? Hint: this is not a renal pathology but the kidneys are the MC organs affected.

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