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Acute pyelonephritis in the transplant setting (allograft pyelonephritis) is a known cause of allograft dysfunction and a complication that occurs in approximately 10-16% of transplanted patients. Given the overlap of clinical findings between acute pyelonephritis and rejection, acute pyelonephritis is seen more often in biopsies performed on allografts than on native kidneys. This 32 year old patient presented with increased creatinine (2.6 mg/dl) 2 years after receiving a deceased donor kidney transplant. As shown in Fig 1 and 2, the biopsy shows severe neutrophilic inflammation associated with remarkable rimming of the tubules, neutrophilic tubulitis and neutrophilic casts. These features are...