Morphologic features of ART nephropathy. Ectasia of renal tubules containing eosinophilic proteinaceous material (tubular proteinosis) (A) and focal lymphocytic infiltrate (B). Mild cytomegaly and anisonucleosis of proximal convoluted tubule (PCT) (C). Marked nuclear dysplasia with mild cytomegaly and tubular ectasia (D). Focal necrosis of PCT epithelial cell (E). Nuclear dysplasia with cytoplasmic inclusion and nuclear vesiculation (F) and early lobulation (G).