PMC5012837_01
Histopathology of kidney biopsy specimen shows focal interstitial infiltration of lymphocytes (small arrows) and plasma cells (arrow heads) in the renal cortex as well as in the corticomedullary junction, along with the mild tubulitis with infiltrating lymphocytes (large arrows; PAS, x200).. Abbreviation: PAS, periodic acid-Schiff.
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The histopathological analysis revealed focal interstitial infiltration of lymphocytes and plasma cells in the renal cortex as well as in the corticomedullary junction, accompanied by mild tubulitis without microcysts (Figure 1).
Microscopic view of the renal cortex showing intraepithelial lymphocyte infiltration (small arrows), erythrocytic cast with flattened tubular epithelium (large arrow), and normal glomerulus (arrow head; H&E, x200).. Abbreviation: H&E, hematoxylin and eosin.
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No tubular necrosis was observed, with erythrocytic casts and flattened tubular epithelium (Figure 2). Analysis of glomeruli showed no evidence of podocyte hypertrophy, glomerular collapse, or endocapillary hypercellularity (Figure 2).