Primer: histopathology of polyomavirus-associated nephropathy in renal allografts

This short article is an introduction to the histology of damage to transplanted kidneys caused by active BK virus infection. Aimed at trainee pathologists and nephrologists wishing to enhance their understanding of the histological basis of the diseases they manage, this beautifully illustrated paper describes the key features, differential diagnosis and clinical implications of this increasingly frequent complication.