Fig. (5) Renal biopsy findings in patients with Henoch Schölnlein purpura nephritis and IgA nephropathy. (A) Light microscopy showing moderate mesangial cell and matrix increase. Glomerular capillary loops are otherwise open. There is no evidence of extraglomerular crescents in this case. (B). Immunofluorescence staining with IgA antibody, showing IgA immune deposits in the mesangial region.

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