Step 2 - Medicine 2008

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An 8 year old child has low-grade fever, arthritis, colicky abdominal pain and a purpuric rash llocalized on the lower extremities. laboratory studies reveal a guaiac-positive stool, urinalysis with red blood cell (RBC) casts and mild proteinuria, and a normal platelet count. The most likely diagnosis is:

Henoch-Schonlein’s vasculitis
Idiopathic thrombocytopenic purpura
Systemic lupus erythematosus (SLE)
Poststreptococcal glomerulonephritis
Rocky Mountain spotted fever