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The above painting shows glomeruli with mesangial hypercellularity, endocapillary hypercellularity, and crescent formation. These findings can be seen in IgA nephropathy, and other active glomerulonephritides. These lesions shown in the painting above are represented in the Oxford Classification for IgA nephropathy. The Oxford classification is a scoring system on kidney biopsies that includes mesangial hypercellularity (M0 = <50%, M1 = >50%), endocapillary hypercellularity (E0 = none, E1 = present), segmental sclerosis (S0 = absent, S1 = present), tubular atrophy / interstitial fibrosis (T0 = <25%, T1 25-50%, T2 >50%), and crescents (C0 = absent, C1 = up to 25%, C2...