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Diagnostic features of acute rejection from biopsies with concurrent polyomavirus nephropathy. Representative images of (A) nuclear inclusions characteristic of polyomavirus cytopathic effect (hematoxylin and eosin) and nuclear large-T antigen staining (inset, highlighted in brown) and (B) intimal arteritis (v1 by Banff criteria), as demonstrated by lymphocytes undermining the endothelium (white arrow).
