Figure 1: (a) Renal biopsy on hospital day 8 demonstrating focal marked acute tubular injury with cell sloughing seen in the tubular lumena (hematoxylin-eosin, X400). (b) Renal biopsy demonstrating tubulointerstitial nephritis; mild oedema and a focal chronic inflammatory infiltrate (arrows) present with some evidence of acute tubular injury. Cellular and granular cast formation (at left) (hematoxylin-eosin, X200).