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By light microscopy, all cases showed proliferative and exudative glomerulonephritis with focal features suggestive of cryoglobulinemia, including hyaline pseudothrombi. Patient #1 (a), patient #2 (b), patient #3 (c), and patient #5 (f) (arrows) and wireloop deposits (patient #4 [d]; circle). Cellular crescents (patient #3 [c], patient #5 [e]) were identified in 4 of 5 cases.
