What is the diagnosis in this patient who had abdominal pain?

Answer B. Henoch-Schonlein purpuraSkin biopsies revealed leukocytoclastic vasculitis with IgA deposition, which is consistent with IgA vasculitis (Henoch-Schonlein purpura). The patient was treated with high-dose glucocorticoids including pulse therapy, which were tapered successfully after cyclosporine was added to the treatment. Henoch-Schonlein purpura, a systemic small-vessel vasculitis, causes palpable purpura in the lower extremities, abdominal pain, arthralgia, and glomerulonephritis.