PMC7691042_01
Microscopic features of a renal biopsy: (a) Swelling of the tubular epithelial cells (arrowheads), with luminal retention of Tamm-Horsfall protein and necrotic debris (arrows), periodic acid-Schiff (PAS) stain, 400x; (b) atypical cytoplasmic blebs (arrows), PAS stain, 400x; (c) focal interstitial inflammatory cell infiltrates, Hematoxylin and Eosin (H&E) staining, 200x; (d) interstitial nephritis consisting of mononuclear cells with a few plasma cells, H&E staining, 400x.
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Tamm-Horsfall protein and necrotic debris (Fig. 1). There were no specific clues regarding the basis of mild kidney dysfunction.
Clinical course of the patient.
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