Severe BK polyomavirus‐induced hemorrhagic cystitis in a kidney transplant recipient with the absence of renal allograft involvement

BK polyomavirus mostly manifests as polyomavirus‐associated nephropathy (PyVAN) in kidney transplant patients and polyoma virus‐associated hemorrhagic cystitis (PyVHC) in bone marrow transplant patients. PyVHC in kidney transplant patients is only reported in four cases in the literature. Our patient had severe hemorrhagic cystitis without renal involvement. We postulate that our patient's exposure to ifosfamide and radiation 8 years prior transplantation might predispose him to this disease.