Case Presentation: A 60-year-old male presented with one week of new onset fevers and fatigue. Past medical history included primary sclerosing cholangitis, orthotopic liver transplant 12 years ago and Epstein-Barr virus (EBV) negative post transplant lymphoproliferative disease (PTLD) with partial response to single-agent Rituximab treatment one-year prior.The patient reported debilitating fatigue, daily low-grade fevers, night [...]