Polyoma virus-induced hemorrhagic cystitis in renal transplantation patient with polyoma virus nephropathy.

We report a biopsy proven case of hemorrhagic cystitis in a cadaveric renal transplant patient with hematuria. Because more and more polyoma virus infection is being diagnosed in kidney transplant recipients, clinicians should be aware that gross hematuria in a recent transplant recipient may represent polyoma virus-induced hemorrhagic cystitis.