Histopathology of renal biopsy. (A) Hematoxylin and eosin stain demonstrating congested peritubular capillaries. (B) Congested glomerulus with segmental sclerosing lesion (black arrow). (C) Large glomerulus with mesangial hypercellularity. (D) Immunofluorescence showing mesangial IgA deposition. Panels A-C were taken on an Olympus BX50 microscope using an Olympus DP12 camera and Olympus image software (Melville, NY). The fluorescent image (panel D) was taken on an Olympus BX51 microscope with an Olympus XC50 camera. Panel A was viewed with a ×10 objective at ×10 magnification (total magnification ×100). Panels B-D were viewed with a ×40 objective at ×10 magnification (total magnification ×400).