Figure 1. The tubular epithelium is flattened, with loss of brush borders and decreased numbers of nuclei. Several tubules show reactive nuclear enlargement with sloughing of cell debris into the tubular lumens.
Figure 2. Small foci of interstitial inflammation are present, containing lymphocytes, macrophages, and occasional plasma cells and only rare eosinophils. Several tubules contain a mixture of neutrophils and cell debris (neutrophil casts).
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