Renal biopsy micrographs for Patient 3 showing diabetic nephropathy and drug-induced acute interstitial nephritis. Renal biopsy revealed diffuse and nodular diabetic glomerulosclerosis (A, Jones methenamine silver 600×). There were diffuse interstitial edema and extensive interstitial inflammation (B) with associated tubular inflammation and acute necrosis, consistent with interstitial nephritis.