PMC5496585_01
Kidney biopsy specimen showing intersitial eosinophils (arrows) at 400x magnification, typical of drug-induced acute interstitial nephritis.
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F1
A kidney biopsy showed extensive tubulointerstitial nephritis with eosinophils (Figure 1).
Immunofluorescence staining of kidney biopsy showing IgA deposits.
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F2
Other features included background mesangioproliferative immunoglobulin (Ig) A nephropathy with 1 crescent and no evidence of acute tubular necrosis or cryoglobulinemia (Figure 2).