Renal biopsy 2-9 years after Henoch Schönlein purpura.

Twelve children and adolescents with classical Henoch-Schönlein purpura (HSP) underwent renal biopsy 2-9 years later. The clinical course was favorable in 10 of the patients who received only supportive treatment. Two patients with a prolonged course, characterized by marked hematuria and proteinuria, were given steroids and azathioprine first and mycophenolate mofetil later.